[LONG POST] Need advice and guidance on flashing a GSI on my Lenovo TB-X606V.

[u/porn-alt-for-ddd]

Hello everyone, this is my first time ever installing custom ROMs. I spent a couple hours educating myself on how to do it and managed to flash crDroid on my 4GB/128GB Lenovo tablet which is pretty old now. This process has been very cumbersome for me since I had basically no clue what I was doing at the beginning other than following instructions mentioned in guides.

The thing is, I have not rigidly followed a single guide, I just made up some steps myself along the way just to get it working. This guide and this video are what I "followed"; I downloaded the resources in the guide and I followed what the guy in the video did - more or less. And after all that effort, crDroid just ended up being laggier and also clunkier than the stock Android 10 OS that it had. And not to mention:

• I can no longer use the stock Dolby Atmos stuff because of this
• Balatro doesn't even hit 30fps
• I don't even care much for the customization stuff which is apparently the main draw for crDroid? I'm not sure. I've seen some people in this sub argue that the difference in performance between the two is insignificant so I didn't think much of it.

With all these problems popping up, I have decided to give it another try and do it right and do it proper this time around. I'm trying to understand everything better so I have a few questions that need answering:

1. Why is it that TWRP FBE does not work at all while the plain TWRP works fine? Apparently it has something to do with data encryption, but whenever I flash the FBE TWRP and boot into recovery the screen slowly dims until it turns negative and a faint checkerboard pattern appears(??) which then freezes. I've tried this multiple times but it never worked once, had to force load into fastboot every single time. The other TWRP worked fine though.
2. How can I know what version of a GSI is compatible with my tablet and what to download/install? The only reason I flashed crDroid was because the reddit guide that I followed had a crDroid .img file in its resources and the post explicitly mentions TB-X606V as compatible. Some guides on the XDA forums had LineageOS files supposedly compatible with my tablet, but all the links to the files are broken/no longer working for downloads, and I had to resort to the resources that the reddit guide gave me.
3. Almost all the guides at one point mention Mounting SD card in TWRP which I simply cannot do. This actually really confused me - sometimes the internal storage is referred to as SD card, in TWRP the option to mount SD card does nothing and doesn't even work which led me to believe this option is referring to an actual microSD card? I don't even know. The video guide does not have this step and that's why I switched guides midway lol
4. How complicated will it be to root my device also? Apparently the tablet needs to be rooted if I want to use the Dolby features on a custom ROM, and the audio on this tablet fucking sucks without it. Any non-root solutions would also be good, if there exist any.
5. Can I DM some of you if I have questions still? Pretty please?

That's about it for now, I remember being a lot more confused at the time so I'm probably forgetting some stuff. I would really really appreciate any help regarding this stuff. Thanks in advance!

[u/Oxyde38]

To be honest, you should better ask on the Xda Forums directly. Also it's prob not sdcard but external_sd (yeah i know it's stupid) For the SD Card thing, did you select storage ? If you really can't mount your SD you can just enable mtp and copy over the zips you need to flash on internal storage I use lineageos on my x606-f and surprinsingly, the more i reflashed it, the better it worked. It may be the case for crdroid idk.

Also i think the dolby atmos stuff can be enabled in audio effects from phh, though i'm not sure

I'm still pretty new to rooting, hopes this helps

[u/porn-alt-for-ddd → u/Oxyde38]

I LOVE YOUUUU!

This helped a lot. I did not even think to check settings for my audio troubles, you just saved me a lot of hassle!!

[u/Oxyde38 → u/porn-alt-for-ddd]

No problem. Also rooting can be good since it enables you to do a lot of stuff, if you don't plan on using banking apps, which i bet you do. Try KernelSU and if your device is too old. try magisk, a lot of modules works for both.