How to choose custom firmware

[styr]

My box is Tanix TX9s almlogic912, the family of q201 with 2R/8 Rom. Buil q201 userdebug7.1.2 NHG47L 20190911 test-key.
What I should look to match the existing firmware. I want to be sure In case of not successful upgrade with custom firmware I can go back with my TWRP backup.
Thank you for any suggestions.

[gefattern]

My box is Tanix TX9s almlogic912, the family of q201 with 2R/8 Rom. Buil q201 userdebug7.1.2 NHG47L 20190911 test-key.
What I should look to match the existing firmware. I want to be sure In case of not successful upgrade with custom firmware I can go back with my TWRP backup.
Thank you for any suggestions.

Hi ,

you must look for the same Specs , S912 and same Wifichip as yours , not sure if Rom or Ram must be the same size , but think well , you can always ask in the CustomRom Thread if it works ,

good luck / gefattern

[styr]

Thanks for your replay. I just open the TX9s and found inside Realtek RTL8189ES-VB-CG integrated single-chip 802.11n Wireless LAN.
Knowing this what version of custom firmware I should look for this board?