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Use magisk to flash the module, can use any root manager not just magisk
Use: /data/overlayfs/tmp/overlayrw [-ro|-rw|-bind] [path_folder]
Instruct: /data/overlayfs/tmp/overlayrw -rw /system/app
After running the command, you can edit files in that directory
If you select root, more rw-allowed partitions will appear
Hidden root | Root
/product/app
, for example, will allow rw to this directory
For magisk be careful when adding partition it may bootloop
Note that you should only add partitions with apk, do not add strange partitions that may be bootlooped
Some paths, if used, can be detected as root
Add link partitions here: /data/overlayfs/tmp/path