after updating my OnePlus 7 Pro to latest e.OS 0.16 my SIM card ist not recognized anymore.
According to an earlier thread No SIM after flashing One +7 pro reverting to Stock and from there going to e.OS 0.16 may fix the issue.
Would someone know a working procedure to bring a 0.16 e.OS over to a Stock Oxygen OS? I tried several reverting variants, e.g. a flash-all from mauronofrio (flash-all-critical not yet), or the procedure I referenced here last year OnePlus 7 Pro issues but so far without success.
I currently have a non-working slot A (no boot or recovery) where I at last had tried flash-all.bat using 10.0.8-EUROPE-OnePlus7ProOxygen_21.E.29_OTA_029_all_2009281534_7b56ba8fbe25f-FASTBOOT.zip from mauronofrio fastbootroms https://sourceforge.net/projects/fastbootroms. And on slot B I have a mostly working e.OS 0.15 and e.OS recovery.
I am unsure which path I should try out next. E.g. when flashing both slots using this procedure https://gitlab.com/LineageOS/issues/android/-/issues/1522#note_274265612 , I am unsure if I should be using the old image in the same post. These versions are probably Pie and trying to downgrade may not be the best idea. Also it seems to be Hydrogen OS (China) and not Oxygen OS, as mentioned on other xda posts.
Would someone know a working ‘back to stock’ procedure? Thanks in advance!
In this thread https://forum.xda-developers.com/t/op7pro-latest-oos-10-3-8-gm21aa-oos-10-0-10-gm21ba-collection-of-unbrick-tools.3956595/ it seems that for my european GM1913 the latest GM21BA stock firmware is 10.0.10 (while the GM21AA global / international firmware seems to be on 10.3.8 already). Is it better to take the EU one because of the radio or should the global one be prefereable, due to closer to current e.OS 0.16?