OP7T ROM Installing Partition Error

[itssata]

After trying to install a custom ROM (PixelExperience for OnePlus 7T [hotdogb]) via fastboot, the installation flashing ended with errors with "no such partition" for odm, product and system I tried everything to get out of the fastboot screen loop. After finding a bat file with IMG files which got me on the Android 11 Beta 1. build (still no WiFi)
What can I do to fix the partition error to get on the Pixel Experience ROM or even get back to the stable build - I did try MSM but it isn't listing the phone even after pressing ENUM.
Please help...

Context (can skip): The latest stable build OOS for my 7T had issues with the microphone not working and so I decided to do a factory reset which resulted in having a clean install but now, WiFi doesn't connect for some reason. After trying some fixes I decided to install a custom ROM.

 

[HueyT]

U need to flash stock recovery (fastboot flash recovery recovery.img) as twrp prevents fastbootD entry. Then type fastboot reboot fastboot to enter fastbootD. Then flash your rom. Personally, I just flash roms via Chinese twrp or 3.5.10 twrp

 

[itssata]

U need to flash stock recovery (fastboot flash recovery recovery.img) as twrp prevents fastbootD entry. Then type fastboot reboot fastboot to enter fastbootD. Then flash your rom. Personally, I just flash roms via Chinese twrp or 3.5.10 twrp

that was my process for the first try - entered fastbootD for the flashing process which ended with the mentioned partition error and the fastboot loop. I realised that TWRP version I got from TOOL ALL IN ONE wasn't going to work as it couldn't access data no matter what.

 

[HueyT]

No twrp can decrypt oos or a11 custom roms data. Chinese twrp can access data only on a10 custom roms if u remove screen lock before booting into twrp for backup

 

[itssata]

What do you reckon I try this time then?

 

[HueyT]

What do you reckon I try this time then?

https://xdaforums.com/t/op7t-oos-10...l-to-restore-your-device-to-oxygenos.3994835/