1. The Phone/Tablet had been ROOT，and support Memory Card or OTG connect function。
4. A memory card reader for MicroSD(the USB OTG can connect computer)。
Get a MicroSD card : Create/Format partitions:
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:)
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。
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 ：
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 simple，I just hope that described in detail has been enough，so writed some more。
Thank you for watching。
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