Transformer Prime slow, unresponsive and does not update (from stock to 7.1.2) - Asus Eee Pad Transformer Prime

Hello,
My rooted Transformer Prime was becoming so slow, I eventually unlocked the bootloader and flashed it … at first with Android 5 KatKiss. But it growed slow quite rapidly.
So I flashed it again with the latest build of KatshMallow 6 but after a few months, Google Play entered in a login loop so I could not update my apps nor install new ones.
So I flashed it once more with KatKiss 7.1.2 #26, a few weeks ago. From the start it was really unresponsive and quite slow (being two different symptoms). I tried to tweak it with Kernel Adiutor but to no avail.
Two days ago, it would not update one of my apps (but updated the others). And today the updates stalled in the "download pending" state.
What can I do to troubleshot my TF201 and give her a youth treatment against what seems like planned obsolescence (I didn't know Asus was following this trend)?
Many thanks in advance!

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What version of TWRP are you using?
Are you doing a full wipe (not including the recovery partition)?
Are you changing the /DATA file system partition to F2FS ?
A few things that might be mucking up the flash.
NP

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Ok, here are the info:
— bootloader 1.00e released by ww_epad_10.6.1.27-20130711 A03
— TWRP 2.8.7.4 @area51
— I formated /data in f2fs
— I wiped Dalvik Cache, System, Cache, Data AND Internal Storage
— last time I flashed, I followed the instruction from point 8 of https://forum.xda-developers.com/tr...uide-tutorial-asus-transformer-prime-t3486237
Does this help? Any tool or other ways to help diagnose my problems?

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I would update the TWRP to the latest version found here;
https://androidfilehost.com/?fid=457095661767150802
NP

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The only advice I can offer is to follow these instructions to the letter: https://forum.xda-developers.com/showthread.php?t=2407248
Install that ROM and don't install all your apps for 24h or so. If it's still slow then it might be on the way out. These things are getting old.
If you're happy after a day or so then proceed to install the ROM of your choice.

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I don't see where you do a [FORMAT];
Go to twrp/wipe/format data then type yes
This is the 1st step after you boot into the recovery console.
NP

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Nektopoli said:
I would update the TWRP to the latest version found here;
https://androidfilehost.com/?fid=457095661767150802
NP
Click to expand...
Click to collapse
I tried this but to no avail

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Nektopoli said:
I don't see where you do a [FORMAT];
Go to twrp/wipe/format data then type yes
This is the 1st step after you boot into the recovery console.
NP
Click to expand...
Click to collapse
Yes, I did it.

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I wonder if it's "slow" like the rest of our tablets, compared with new devices, my TF201 is no speed demon by any stretch of the imagination, but it can run KODI and other
apps under 7.1.2 that it couldn't under 4.1.1. I find I'm waiting a few seconds after tapping on the app button for it to open but it's not a long pause.
NP

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djmcnz said:
The only advice I can offer is to follow these instructions to the letter: https://forum.xda-developers.com/showthread.php?t=2407248
Install that ROM and don't install all your apps for 24h or so. If it's still slow then it might be on the way out. These things are getting old.
If you're happy after a day or so then proceed to install the ROM of your choice.
Click to expand...
Click to collapse
Okay, so I downgraded to AndroWook Prime HairyBean v2.31, as suggested by djmcnz. Great move :good: as I recovered the responsiveness I was used to: now, when I click something, the related event happens without delay (these few-seconds delays were happening when opening an app, like Nektopoli said, but unfortunately also whenever I interacted with anything, in any app). Sure, I would not say it really "unleashed the beast": I know our TF201 are not in the same league as more recent devices. Still, it's also way faster than it became with the flashing explained in my original post. Moreover, in more than a month, I had no problem updating apps. So in a way, original problem solved. Thanks all! :highfive:
But … now my problem is I need a newer Android to be able to install some apps/games, mostly turn-based boardgames (I have no need for realtime 3D on my tablet).
What would be your recommendations for my next step?

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robotneg said:
What would be your recommendations for my next step?
Click to expand...
Click to collapse
Install KattKiss now: https://forum.xda-developers.com/transformer-prime/development/rom-katkiss-nougat-t3459313

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Next step, like the rest of us is waiting for Oreo 8
https://www.android.com/versions/oreo-8-0/
NP

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djmcnz said:
Install KattKiss now: https://forum.xda-developers.com/transformer-prime/development/rom-katkiss-nougat-t3459313
Click to expand...
Click to collapse
Any how-to guide to follow in order to have the cleanest installation possible?

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robotneg said:
Any how-to guide to follow in order to have the cleanest installation possible?
Click to expand...
Click to collapse
What version of TWRP are you currently running?
NP

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Nektopoli said:
What version of TWRP are you currently running?
NP
Click to expand...
Click to collapse
Right now, the one that's provided to install Androwook, ie. 2.5.0.0

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Here's TWRP 2.8.5.1: https://androidfilehost.com/?fid=95916177934539154
Flash this, once you get into TWRP v2.8.5.1 working you can flash 3.1.0-1 it's an IMG file and 2.5.0.0 won't flash IMG files so you have to upgrade in steps.
TWRP 3.1.0-1 is here: https://androidfilehost.com/?fid=457095661767150802
NP

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Nektopoli said:
Here's TWRP 2.8.5.1: https://androidfilehost.com/?fid=95916177934539154
Flash this, once you get into TWRP v2.8.5.1 working you can flash 3.1.0-1 it's an IMG file and 2.5.0.0 won't flash IMG files so you have to upgrade in steps.
TWRP 3.1.0-1 is here: https://androidfilehost.com/?fid=457095661767150802
NP
Click to expand...
Click to collapse
So I did flash TWRP 2.8.5.1 and reboot: okay.
Then I flashed TWRP 3.1.0-1 but now I get a "Unrecoverable bootloader error (0x00000000)" message when I try to reboot in recovery :crying:
What can I do now as I cannot use TWRP anymore to flash anything

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robotneg said:
So I did flash TWRP 2.8.5.1 and reboot: okay.
Then I flashed TWRP 3.1.0-1 but now I get a "Unrecoverable bootloader error (0x00000000)" message when I try to reboot in recovery :crying:
What can I do now as I cannot use TWRP anymore to flash anything
Click to expand...
Click to collapse
Tried to use fastboot to flash it again and it worked. Now, going on wiping, formating and flashing the rom.

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I had the same problem. Just typing ten letters in a text entry box could take a minute to complete.
Fix was to run Trimmer (fstrim) by AdminseHow from the play store. Sorry I can't link because my account is too new. App is totally free, no ads, no purchases, no begging for donations. It does require root.
It trimmed 185 MB on first run which doesn't sound like a lot but the difference was huge. Can actually use a web browser now. It has an auto-trim feature; be sure to enable this. The default interval (weekly) is fine.

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Bloopbloopson, I'm giving fstrim a try.
NP