[GUIDE][SM-T290/SM-T290N] Samsung Galaxy Tab A 8.0 (2019) - How to Install LineageOS 18.1 (GSI) + Gapps

[Just Mike]

I wasn't flashing the Multidisabler every time, I only thought you had to do that the first time. I did before flashing 18.1, but all I did when I flashed 19.1 is wipe data (even though data should have been clean, didn't complete setup)

I'm really starting to hate Samsung. I wish the Pixel Slates weren't so expensive. I'd love a tablet powered by an i7...

I see. I should've been more clear about the Multidisabler, small mistake from my end.

I did hear about those Pixel Slate tablets, but they don't sell those in The Netherlands afaik, so I don't know a whole lot about them. In fact they only recently started to sell the Pixel 7 here, the older models had to be imported from Germany.

But to stay on topic, did the 19.1 image actually boot?

 

[V0latyle]

I see. I should've been more clear about the Multidisabler, small mistake from my end.

I did hear about those Pixel Slate tablets, but they don't sell those in The Netherlands afaik, so I don't know a whole lot about them. In fact they only recently started to sell the Pixel 7 here, the older models had to be imported from Germany.

But to stay on topic, did the 19.1 image actually boot?

When I got 18.1 to boot, I wiped data and flashed 19.1. It booted no problem. But after trying various 20.0 images, all of which bootlooped, I tried wiping data and going back to 19.1, and it still bootloops.

I'll screw with it some more this evening

 

[Just Mike]

When I got 18.1 to boot, I wiped data and flashed 19.1. It booted no problem. But after trying various 20.0 images, all of which bootlooped, I tried wiping data and going back to 19.1, and it still bootloops.

I'll screw with it some more this evening

A'ight. Just follow the instructions I listed and you should be good. Good luck!

 

[V0latyle]

A'ight. Just follow the instructions I listed and you should be good. Good luck!

Yeah we'll see. It looks like the only thing I haven't done is flash the multidisabler after wiping data, but I thought this was only necessary once.

 

[V0latyle]

So the multidisabler fails:

- Detected a T290 device with a ATF1 bootloader.
- The environment appears to be Android 16.
- Mounting /system_root...
-   Attempt failed.  Mounting at /system_root...
-   Even that attempt failed.  Aborting...

I noticed that I can't mount/unmount /system in TWRP. Not sure why.

 

[Just Mike]

So the multidisabler fails:

- Detected a T290 device with a ATF1 bootloader.
- The environment appears to be Android 16.
- Mounting /system_root...
-   Attempt failed.  Mounting at /system_root...
-   Even that attempt failed.  Aborting...

I noticed that I can't mount/unmount /system in TWRP. Not sure why.

Same here. Hmm...

Not sure if this will help, but can you try to reboot to recovery and try to format data and flash the multidisabler again?

 

[V0latyle]

Same here. Hmm...

Not sure if this will help, but can you try to reboot to recovery and try to format data and flash the multidisabler again?

Wiping /system fixes it

I got the 20.0 bvS to boot, but Gapps didn't install properly.

Still testing to confirm this but it almost seems like the unrooted flavors are the ones that are bootlooping?

Yep...Seems like that is the case. The only images that will boot are the S ones, but I don't use SuperSu

 

[Just Mike]

Wiping /system fixes it

I got the 20.0 bvS to boot, but Gapps didn't install properly.

Still testing to confirm this but it almost seems like the unrooted flavors are the ones that are bootlooping?

Yep...Seems like that is the case. The only images that will boot are the S ones, but I don't use SuperSu

A'ight, we're making progress!

I also don't use SuperSu, but I'll just leave the Phh menu in the settings alone.

You also mentioned that Gapps failed to install, did it give out any sort of error?

 

[V0latyle]

A'ight, we're making progress!

I also don't use SuperSu, but I'll just leave the Phh menu in the settings alone.

You also mentioned that Gapps failed to install, did it give out any sort of error?

I hadn't resized system.

Talked to Andy in his thread, it sounds like the issue may be the secure builds, not root.

 

[Just Mike]

I hadn't resized system.

Talked to Andy in his thread, it sounds like the issue may be the secure builds, not root.

I see. Although I haven't tried any of the secure builds, could you try to test any of the secure builds to see if any of those can actually boot? Or did you flash the secure builds instead of the regular flavours?

 

[V0latyle]

I see. Although I haven't tried any of the secure builds, could you try to test any of the secure builds to see if any of those can actually boot? Or did you flash the secure builds instead of the regular flavours?

At first I thought it was the builds with root, but it turns out that ALL the builds without root are secure. I haven't done extensive testing with 18.1, but since all builds are rooted and none are secure, I think it's pointless. It appears that on the T290, the secure/unrooted builds crash. @AndyYan is aware of the issue as the props changes seem to affect other devices as well.

 

[levanhoanh2000]

5. Go back into Install and select your MindTheGapps zip file and install it.

Hi bro, I followed your guide to step 5, and it's no enough space to install Gapps. But I can't see the System partition in TWRP to do the next step, even I tried to Mount it. Any suggestion here? Thanks.

 

[Kona67]

Working well but USB MTP in windows not working for me.

 

[ebod]

Hi, I'm here with a UK stock rom SM-T295 ( LTE version ) that I want to upgrade to LineageOS 20.0 but so far in 2 attempts I've failed.

I've got bootloader unlocked ( with stupid annoying Samsung warning message ) and achieved root using TWRP following a guide on this forum for the SM-295.
My stock rom is not the oldest..nor the newest. Its an Android 10 version. Not sure whether it matters either way.
I was guided to use a GSI file on xz file which I unzipped to an img file added to and SD card. I did a thorough wipe beforehand of all except internal folders and SD card.
The image install appeared to go fine, but on re-start it was just stuck in a boot cycle.

Its painful recovering everything back to a rooted stock rom and keeping TWRP installed too. So I just wanted some clear direction on taking an unlocked/rooted SM-T295 and making it. Android 13 Maybe some of these snippets of pics I've taken along the route can trigger some to spot glitches.
Thanks

 

[thinsea]

Hi, I'm here with a UK stock rom SM-T295 ( LTE version ) that I want to upgrade to LineageOS 20.0 but so far in 2 attempts I've failed.

I've got bootloader unlocked ( with stupid annoying Samsung warning message ) and achieved root using TWRP following a guide on this forum for the SM-295.
My stock rom is not the oldest..nor the newest. Its an Android 10 version. Not sure whether it matters either way.
I was guided to use a GSI file on xz file which I unzipped to an img file added to and SD card. I did a thorough wipe beforehand of all except internal folders and SD card.
The image install appeared to go fine, but on re-start it was just stuck in a boot cycle.

Its painful recovering everything back to a rooted stock rom and keeping TWRP installed too. So I just wanted some clear direction on taking an unlocked/rooted SM-T295 and making it. Android 13 Maybe some of these snippets of pics I've taken along the route can trigger some to spot glitches.
Thanks

You can flash BL first https://forum.xda-developers.com/t/...g-galaxy-tab-a-8-0-2019.4515305/post-88202549