LetsGoApp! Let the APP 100% move to SD card or USB OTG. Use Introduction!

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Android 4.1 up! How to let the APP 100% move to MicroSD or USB OTG device by LetsGoApp?




Declaration:This teaching supply to Android 4.1 above devices with reference from LetsGoApp's website
Attention: You create your MicroSD partition must be carefully ! The MicroSD have write times life,if you over-write it。
Whether MicroSD or OTG,it's strongly recommended to choose SanDisk(High Stability)
Other brands may be formatted in EXT3/EXT4 after the end of the fault。


Because of the way the change management program on Android 4.0.x,in the past,a convenient APP-APP2SD has been unable to run。
As Link2SD, although App can be moved to the MicroSD,but to choose the APP is limited(Not all can be move)。
On the other hand,Link2SD only can move the /data/app and /data/dalvik-cache these folders within the APP,but not all App's data


LetsGoApp is generated using mirroring source on desktop shortcut,when the APP is moving to a MicroSD,the Android system will rest a link icon。
Because it is a linked icon,It takes up very little space(just like as Windows Desktop's Icon 2~5kb),it is really to storage in the MicroSD to executing。
In addition,the LetsGoApp has more powerful functions is:
1. APP can copy back to Phone ROM through LetsGoApp。
2. LetsGoApp can move the APP to the MicroSD or USB OTG,that You will not use the Phone ROM。
3. Direct to mount 2nd Partition-EXT3 or EXT4。


Through LetsGoApp, the APP still can update/uninstall from Play Store。And just need to click create the link or remove the link,that you can easily move between the ROM and external MicroSD。


You don't need high speed memory card,I just use for general(recommend CLASS 4 above),and there is no any compatibility problems。
Have been tested MicroSD: Transcend 16G、Kingston 16G、SanDisk 8G.
                         OTG: Transcend 32G、Kingston 32G、SONY 32G、SanDisk 32G.
Actually!Whether the memory card or OTG recommend to SanDisk and SONY 。
Other brands failure rate is too high,that maybe fault after formatting。








1. The Phone/Tablet had been ROOT,and support Memory Card or OTG connect function。

2. Get a MicroSD and then create 2 partitions。The 1st partition is FAT32、the 2nd partition is EXT3/EXT4,and set Avtice at 2nd partition(example:32GB)。
3. A PC for Windows OS。






4. A memory card reader for MicroSD(the USB OTG can connect computer)。



Get a MicroSD card : Create/Format partitions:


1. I have to reset the MicroSD and create 2 partitions(1st-FAT32、2nd-EXT3/EXT4) to let the phone to mounting it like as internal ROM,so….






download EaseUS Partition Master Free (Pressing Here Get Download)and install it by computer。


P.S: If you choose EXT4 please download MiniTool Partition Wizard Home Edition,because the usage are the same,that I am not otherwise specified!






2. Make sure connected the MicroSD,and executing EaseUS Partition Master to Create Partition :

be careful to make sure what the MicroSD ID is yours!do not click to wrong target such as Hard Disk(C: or D:)



Creating FAT3 for 1st partition and create as : Primary。As for FAT32 size decide yourself,and then click OK。
(The 1st partition-FAT32 could create it bigger to use . such as:photos、movies)



Creating as Primary and EXT3 for the remaining space,and click OK !


Right-click and set Active for 2nd-partition EXT3,and then Apply it :format EXT3 need more time,and waiting! After finished,take the memory card  connect the phone。








Install APP – BusyBOX :
P.S : If the storage device is OTG,that you have to installing one more APP – USB OTG Helper by here http://www.letsgoapp.net/?cat=28


Installing/Executing BusyBOX by Google play Store。




Install LetsGoApp :

1. Installing LetsGoApp by Play Store。https://play.google.com/store/apps/details?id=tseng.lets.go.app


Introduction UI :

1. Main.

2. Vice-Spinner Showing. 

3. Menu by menu button. 

Finally,all of the above steps results will be presented on the 4. App list



2. Press the "Menu" key select "Mount SD card 2nd partition" and follow the instructions to reboot again. 

If you mount ext3 patition not reboot by LetsGoApp  for MicroSD ,Please use Hot reboot


If the EXT3 partition can not to be hang it up,temporarily use the APP-LINK2SD mount EXT3 partition



The APP – OfficeSuite Pro for example : click vice spinner – ROM,and to show all APP of phone。Find OfficeSuite Pro from the APP's list,and then click it once,the move order will be start to moving to MicroSD。(Does not recommend moving the system built-in program)。


After finished,click vice spinner – SD,there is a APP – OfficeSuite Pro has been copyed into the MicroSD。Why I said "COPY", because the sources APP –  OfficeSuite Pro still has within the phone's Rom(Back to ROM,that you can see it)。So now,I have to delete the sources APP –  OfficeSuite Pro of ROM,and then Linking it from MicroSD。Finished above steps,this is a complete process。


For details please see the following my steps :


First of all,click OfficeSuite Pro,and then choose Remove。You can go back to the ROM to make sure,when you remove it has been finished。


Click OfficeSuite Pro again,you will find the remind message just is not the same with before。The before is : " Excute、Remove、Cancel ",  but now is : " Install、Remove、Cancel "。

Now! I click " Install " to let the APP of MicroSD to be link with Android。


Then will remind : Link source from ?  Of course is SD card,my goal is to save space on my phone, the APP is stored on the SD card to perform。 



You will get message to remind you need to quick reboot(Hot Reboot) once,after the linking is completed。If you have many APPs need to link,you can first press Cancel,and then repeat above steps after all the moving was complete,finally to quick reboot it once,it will save time and has efficiency



After rebooting, LetsGoApp can auto run and list Apps Menu。If you did not mount SD card,relative ! the APP's icon will Gray,because the APP was disappeared。




You can click Setting -> Storage and check.

You can discovery , Your phone's ROM is saved.




You can run App through LetsGoApp.

OfficeSuite Pro is easy to run.




Let APP install to ROM from the MicroSD or USB OTG:

Example,there are some APPs,that I want to use。LetsGoApp can installation directly from SD card copy back to my phone's ROM ,the function can sharing among users。Users can choose the APP of the OTG or MicroSD, and move App to the phone’s ROM.

In other words, LetsGoApp can move and execute APP between OTG/MicroSD and phone’s ROM. There are more choices, You can move APP from phone’s ROM to the other external storage

Now example for Candy Crush within MicroSD to pressing “Install



Click the button “ ROM “,and you can move the APP to the phone’s internal storage " ROM "



After moved, the system need be reboot once





Removing MicroSD after reboot, the Candy Crush can be execute from phone's ROM,and there is not any different to download from Play Store




Emancipation Your Phone Space,And Enjoy It ~~~!!



Above steps looks like a lot more。Actually!It is very simpleI just hope that described in detail has been enough,so writed some more。

Thank you for watching


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The User Guide About LetsGoApp(App to SD or USB OTG) for English

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2019 Personal Cloud

LetsGoApp User Guide



App to SD or USB OTG (External storage can also be an internal storage)

This idea from storage shortage and backup.This idea from storage shortage and backup.

You can copy Apps in your device through LetsGoApp to SD or USB.

Then you can move SD card or USB from this device to another device.

You can execute Apps in new device and don’t need to install again.



Support Android 4.4 , and it need fixed SD card write/read permissive(not Android 4.4 skip)






(2)What should I prepare?

Step 1:Creating & Formatting the storage device – MicroSD and OTG.

Step 2:Rooting Android Device.


Step 1:About User Interface.

Step 2:How to use LetsGoApp with the storage device – MicroSD and OTG?

(4)Move APP to the Phone ROM from the MicroSD or OTG.

(5)To Unlink the App’s link from storage device.

(6)About LetsGoApp.

(7)Q & A.




LetsGoApp can execute all the other Apps on OTG and MicroSD(not install). Therefore, it can effectively solve the problem of the shortage of ROM of the portable device and to easy backup your Apps.

The LetsGoApp is an application aimed at solving the shortage of ROM's applications for portable device. It often happens when a portable storage device has been installed a large number of applications in it.

NOTE:According to user choice, there is a Third-Party App for mounting the USB OTG .



(2)What should I prepare?

Preparing a MicroSD or OTG device, you must to create 2 partitions(1st-FAT32、2nd-EXT3) and formating it by EaseUS Partition Master. The partition steps for both MicroSD and OTG are the same.



(B). Right-click on the OTG, and choose “Create partition”.

(C). Setting size 3 ~ 5 GB or more for FAT32 as 1st-partition, and Create as “Primary”.

(D). Setting EXT3 partition for over space, and Create as “Primary”.

(E). Right-click on the EXT3 and choose “Set active” ,then “Apply” it.

(F). Removing the OTG device after the work is finished.




Touching “Install” , then “Smart Install”.

(B)Mounting the OTG's EXT3 by USB OTG Helper (If you use OTG device)

Please download by http://www.letsgoapp.net/?p=241 , then installing USB OTG Helper and mounting with the OTG device. There will be a notice of 2 drives mounted to complete. If it is not. As long as reboot Android Device, and repeat the above steps.


(C)Mounting the MicroSD's EXT3 by LetsGoApp (If you use MicroSD).

LetsGoApp V4.4 can't  mount SD EXT3 patition for less smart phone,please use Link2SD to mount EXT3 patition,We can fix late

1. When use MicroSD, please mount MicroSD second partition – EXT3 through LetsGoApp at first time.



(3)Operating Instructions for LetsGoApp.

This chapter will be explanation run all the other Apps on OTG or MicroSD.
NOTE:Make sure created and format 2 partitions(1st-FAT32、2nd-EXT3) within MicroSD or OTG .




(A)Touching the option “Phone ROM” of Vice-Spinner to show the App’s menu list, and you can choose the target to moving .(For example:Candy Crush Saga)




(C)Pressing Candy Crush Saga again, and “Install” it.
Remind!This step is linking App to Android Device, not copy App to phone ROM.


(D)Touch the button “Cancel” to retune to step(A), to move the other Apps if you have needs. After all of the moving work is finished, and then touching the option “Quick Reboot” to rebooting by Menu button.


(E)After rebooting, (Fig.1、2) the application “Candy Crush Sage” can be run by LetsGoApp and Android Desktop. Conversely, (Fig.3) when the OTG device is not mounted, there is only unlinked icon to show within Android Application Manager.



(4)Move APP to the Phone ROM from the MicroSD or OTG.

LetsGoApp can move your App to the MicroSD and OTG execution from the phone, you can also move from the MicroSD and OTG  to your Phone ROM.

1. Candy Crush within the OTG for example

3. After finished, quick restart once.

4. When quick restart complete, unmount the OTG device and then executing Candy Crush through desktop.


(5)To Unlink the App’s link from MicroSD or OTG.

Actually, maybe there are many storage devices, and then sometimes must to be replace. Therefor, the replacement behavior perhaps cause the application update fails or recognition errors.


(A)Pressing Menu button to show the menu list, and then release link from storage device.


(B)Pressing the option "OK" will unlink for APK.



(6)About LetsGoApp.


Update date:12. 31. 2015

Release date:07. 01. 2014

Content Rating:All

Support Android 4.1.X~5.1 

HTC bufferfly、SONY Z 、ZL、MI2X、MI3X、IAOMI – Redmi、 Sumsung S2 、S3、S4、Note2、HUAWEI honor 3C 3G/A6S(MT6582)

Support Android 4.4 , and it need fixed SD card write/read permissive(not Android 4.4 skip)




(7)Q & A.


Q:What the Android's version has supported, and portable device brand can be supported by LetsGoApp?

A:For now, LetsGoApp stable supported for Android v4.1.x ~ 5.1, and continuing to support for all class.

Q:What is internal ROM and portable storage device?

A:The ROM is an storage capacity within portable device, that has limited by Manufacturer's specifications. The portable storage device is MicroSD and USB On-The-Go.

Q:Before run LetsGoApp, should I have to install the Third-Party application first?

A:Exactly, and must to downloading USB OTG Helper from LetsGoApp official web.

Q:How to Rooting for portable device?

A:Please go website and google to see how to rooting your own portable device.

HTC's device need S-OFF. Samsung S4 use OTG for Android 4.3↑, You need close KNOX .

Android 4.4 need fixed SD card write/read permissive

Q:About MicroSD and OTG's specifications, whether there is limited?

A:User can choose capacity and brand

Q:The OTG's temperature is always high. Is this is correct?

A:Yes. It's useable.

Q:No the other methods to solve?

A:Actually, there is suggestion for this problem. You can use SanDisk's MicroSD for storage device.

Q:How to solve  of USB OTG Helper to mounting with only one drive?

e other way, you can  press "mount" twice or let the portable device reboot, and try again.

Q:Can I hold the portable storage device use for mobile phone for more than one?

A:Yes. This is the concept of LetsGoApp.

Q:How can I plan the space of partitions?Can I still storing private data into the partition FAT32?

A:YES. For example:Photos、Videos、or be Storage Disk to use for PC, and then storing for all of your private data. As for partition-EXT3, it is to store for applications. Anyway, space size with personal preferences.

Q:Can I still update within portable device from Google Play Store?

A:Yes. But the portable storage need has been mount.

Q:Reading a lot of above for user guide, I confused still. What is the point of LetsGoApp?

A:In fact, every day we have to face a lot of data. These including photos、videos、music and the increasingly entertainment features of Apps. What the better solve method is a important problem, wherein is LetGoApp lets you develop a personalized storage device, and then run with it, that just like as a portable Cloud.

Q:About "LetsGoApp", it is look like as Link2SD.

A:Yes, but not almost for all. For example with MicroSD:The program only run App by Link2SD from the single portable device. If there are more than one with mobile phone, that is not allowed to share of the applications with each other. But now, LetsGoApp was already to solve this problem.





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