The DOOGEE N40Pro version is updated as follows：
Software version link：https://1drv.ms/u/s!AttudHY3VOazg0utQ9sK_R-PtjK9?e=2ECrNA
Flash tool operation is recommended to experienced users only. If you are not yet an experienced flash tool user, please carefully read the flash tool tutorial before proceeding, and strictly follow each instruction.
Except if an authorized or responsible expert directly asked you to do that,
never format the flash chip of your device or you instantly lose your warranty!
DOOGEE N40Pro receives all updates automatically via GOTA method. You need this tool only in case of emergency (if you've bricked your phone), if you want to apply a clean install or if you want to clear all root access and custom recovery to make your phone able to receive GOTA updates again. Moreover, flashing with SPFT is the only option to repair (replace) damaged system software.
Flashing tool link：https://1drv.ms/u/s!AttudHY3VOazgRRX56VwVwWuVqpH?e=l9pWt2
After auto update via the network, the fingerprint stopped working, invisible in the settings.
Build number: DOOGEE-N40Pro-Android11.0-20220506
Firmware update "22-5-9 m880b-dg-1913-64-1024g48g-hdp-bom6-r0-cts-eu_DOOGEE-N40Pro-Android11.0-20220506_R17 量产软件（欧盟）.zip" did not help.
@Nikolai Zemel Good day, your fingerprint is invalid when you upgrade online through the network. And then the firmware flashing the fingerprint is not good, right? I would like to ask if your fingerprint is good before the upgrade?
That worked, thanks so much!