Modding Phantom 3 / Height limit mod, fw update not working

[cybtrash]

Hello,

I tried using P3I1-FW-Toolv2 (by digdat0) tool to remove the height limit of the Phantom 3 Pro.

I guess my drone has FW 1.08.0080, because this is the last entry I found inside "P3X_FW_RESULT_AB.txt".

Packet: P3X_FW_V01.08.0080.bin
Upgrading ...
Result: Success.

So I used V01.08.0080_P3x_dji_system.bin as base image and changed both parameters:

advanced_function.height_limit_enabled = 2
flying_limit.max_height = 9000

I renamed the created firmware update file to PMCAPPFw3.bin and put it inside the SD card and forced an update process.
Sadly it is not working, the LOG says

[00015266]========== remo-con disconnect. boot(15) ============
[00015337]Firmware [C:\PMCAPPFw3.bin] detected, card sn [xxxxxxxxx].
[00015400][03 06] Firmware upgrade start...
[00057985][03 06] Firmware upgrade finish failed (step = 2, err = 0xaa).
[00088060]Done.

The fw file on the SD card gets renamed to PMCAPPFw3_damaged.bin.

I don't know what I did wrong.
Does anybody here have some experience with modding Phantom 3?