[Android General] adfree:
freshul:/ $ cd /data/fota
freshul:/data/fota $ ls -a1l
total 11
drwxrwx--- 2 system system 3452 2022-12-28 23:35 .
drwxrwx--x 54 system system 4096 2023-01-20 02:13 ..
freshul:/data/fota $ whoami
system
freshul:/data/fota $ cd /efs
freshul:/efs $ ls -a1l
total 132
drwxrwx--x 15 system radio 4096 2021-11-21 05:26 .
drwxr-xr-x 27 root root 4096 2008-12-31 15:00 ..
drwxrwxr-x 2 radio system 4096 2021-01-01 12:00 Battery
drwxrwxr-x 2 system system 4096 2021-11-20 08:08 FactoryApp
drwxrwx--- 3 system system 4096 2021-01-01 12:00 biometrics
drwxr-xr-x 2 radio system 4096 2022-11-07 15:26 carrier
drwxrwx--x 2 radio system 4096 2021-01-01 12:00 cpdebug
drwxrwxr-x 2 system system 4096 2021-01-01 12:00 gatekeeper
drwxrwxr-x 2 root radio 4096 2021-11-21 05:38 imei
drwx------ 2 root root 16384 2008-12-31 15:00 lost+found
drwxrwxr-x 2 system system 4096 2021-11-20 08:50 lpm
-rw-rw---- 1 root system 256 2023-01-20 02:14 lpm_boot.log
drwxr----- 2 system system 4096 2021-01-01 12:00 pdp_bkup
drwxrwx--- 2 system system 4096 2022-07-16 08:45 pfw_data
drwxrwx--x 2 radio system 4096 2023-01-10 03:29 recovery
drwxrwxr-x 3 radio system 4096 2022-02-09 08:08 sec_efs

Maybe this could help with FOTA Delta aka update.zip...

And few Backup thingies...

Tried also few stupid things like this... without success...

freshul:/dev/block $ cp /dev/block/steady /sdcard/systemTest_v1.bin
cp: /sdcard/systemTest_v1.bin: Permission denied

freshul:/ $ dd if=/dev/block/mmcblk0p3 of=/sdcard/steady_dump.bin
dd: /sdcard/steady_dump.bin: Permission denied

Only as info... from GW4 user...

Best Regards

Edit 1.

freshul:/efs $ cd /data/fota
freshul:/data/fota $ mkdir testme1
freshul:/data/fota $ ls -a1l
total 14
drwxrwx--- 3 system system 3452 2023-01-20 03:00 .
drwxrwx--x 54 system system 4096 2023-01-20 02:13 ..
drwxr-xr-x 2 system system 3452 2023-01-20 03:00 testme1

Instead pushing file short tested about write access...

Edit 2.

freshul:/ $ whoami
system
freshul:/ $ mount -vo remount,rw /
mount: '/dev/block/dm-0' not user mountable in fstab

Edit 3.

|freshul:/ $ cd /efs/imei
freshul:/efs/imei $ ls -a1l
total 32
drwxrwxr-x 2 root radio 4096 2021-11-21 05:38 .
drwxrwx--x 15 system radio 4096 2021-11-21 05:26 ..
-rw-r--r-- 1 system system 3 2021-11-21 05:25 cid.dat
-rw-rw-r-- 1 radio system 3 2022-12-28 23:35 mps_code.dat
-rw-rw-r-- 1 radio root 3 2022-12-28 23:35 omcnw_code.dat
-rwxrwxr-x 1 system radio 14 2021-11-21 05:25 prodcode.dat
freshul:/efs/imei $ exit
freshul:/ $ whoami
shell
freshul:/ $ cd /efs/imei
/system/bin/sh: cd: /efs/imei: Permission denied

Edit 4.

Nice, working for me.

freshul:/storage/emulated/0 $ whoami
system
freshul:/storage/emulated/0 $ cp mps_code.dat /efs/imei
freshul:/storage/emulated/0 $ cd /efs/imei
freshul:/efs/imei $ ls -a1l
total 32
drwxrwxr-x 2 root radio 4096 2021-11-21 05:38 .
drwxrwx--x 15 system radio 4096 2021-11-21 05:26 ..
-rw-r--r-- 1 system system 3 2021-11-21 05:25 cid.dat
-rw-rw-r-- 1 radio system 3 2023-01-20 05:02 mps_code.dat
-rw-rw-r-- 1 radio root 3 2022-12-28 23:35 omcnw_code.dat
-rwxrwxr-x 1 system radio 14 2021-11-21 05:25 prodcode.dat
freshul:/efs/imei $ cat mps_code.dat

Funny

freshul:/ $ whoami
system
freshul:/ $ cd /sdcard
/system/bin/sh: cd: /sdcard: Permission denied