Help Please suggest a trustworthy customer ROM to install on Mi 4

[Vikram S]

I have a Xiaomi Mi 4 phone. android version is 7.1.2 and my phone manufacturer is not likely to release android 8 update for my model. So i plan to install android 8 or 8.1 using custom rom (for running some corporate apps) and not interested in android 9.
Please let me know if Pixel experience custom ROM is open source or not. Apart from lineage, what are other trustworthy open source custom ROM?
If i go for open source and popular custom ROM, chances of anyone writing code for backdoor entry to my phone or info from phone getting transferred to developer is slim, right?

 

[Dannydet]

https://forum.xda-developers.com/mi-4/development#romList

 

[ocnbrze]

most custom roms are safe. most devs are pretty reliable.......now i say most. just like anything, do your research first before installing. always look to xda for custom roms. xda is a developers forum. it is where most will publish their roms or other root goodies.

just make sure to never download anything from an untrusted site.

and lastly before doing anything make sure you have a nandroid backup. do not flash or alter anything unless you do a nandroid backup. if something goes wrong you can go into recovery and restore a nandroid backup and you are good to go.