Got my TF201 in a mess :( - Asus Eee Pad Transformer Prime

i had the TF201 running on Cyanogenmod kitkat but it was getting slow and some apps needed a new verision of android.
As i hade no further upgrade path through Cyanogen mod i "downgraded" to Hairybean https://forum.xda-developers.com/showthread.php?t=2407248 as a starting point for upgrading as all ROM how-to's were advising a bootloader upgrade.
i got hairybean recovery+bootloader & JB installed and working successfully, then proceeded to try to upgrade to Zombipop.
Made two mistakes that i'm aware of.
i didn't do a backup of the working system i had. (dumb)
i installed TWRP 2.6.3 which was the latest version listed on the TWRP website for the TF201 https://dl.twrp.me/tf201/ instead of the reccomended 2.8
somewhere along the line i messed something up and found myself in the following situation
i have Android cardhu-user bootloader <1.00 e> released by "ww_epad-10.6.1.27.1-20130711
and at that poiint i also had TWRP recovery 2.6.3 installed
No OS, the tablet dropped straight into recovery mode.
TWRP recovery 2.6.3 was asking me for a password. i have never had a password on this machine and TWRP was not previously asking for this prior to my attempt at installing zombipop.
if i cancel that request then i can't mount any storage in order to try install anything further. The internal file structure is there but it's not showing any files
"Storage: internal storage (0MB)
i cannot enter sideload mode
Errors read: cannot find partition size for /misc / staging /data /boot /recovery
and cannot mount cache.
i assume files are there but are encrypted and cannot be accessed without password
Back in bootloader mode, with fastboot i then tried to flash TWRP 2.8.5.1 blob file ( which i have subsequently found on another site) which i was able to do.
and after getting into that it was no longer asking me for a password but
i can't do a factory reset ( wipe, data, cach and dalvik) prior to trying to flash a new ROM. i just get a load of errors about being unable to mount /system /cache and /data. this makes me wary of trying to flash anything else. it's like what ever the issue that was prompting me for a password previously, is still there. the only difference is with 2.8.5.1 i can actually mount external cards now, though i still cant start ADB sideload properly it reports unable to mount /data
Ultimately i'd like to get it on any rom greater than KitKat which was the last working CynogenMod I had. But right now i'd just settle for having it working on anything at all again.
i'd be grateful for any advice.
<update> using the advanced wipe functions in TWRP I think i have sorted the problems with the /system /cache and /data folders. they are no longer giving errors.
stopping for night now though and coming back to this tomorrow with a fresh head.

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Harani said:
i had the TF201 running on Cyanogenmod kitkat but it was getting slow and some apps needed a new verision of android.
As i hade no further upgrade path through Cyanogen mod i "downgraded" to Hairybean https://forum.xda-developers.com/showthread.php?t=2407248 as a starting point for upgrading as all ROM how-to's were advising a bootloader upgrade.
i got hairybean recovery+bootloader & JB installed and working successfully, then proceeded to try to upgrade to Zombipop.
Made two mistakes that i'm aware of.
i didn't do a backup of the working system i had. (dumb)
i installed TWRP 2.6.3 which was the latest version listed on the TWRP website for the TF201 https://dl.twrp.me/tf201/ instead of the reccomended 2.8
somewhere along the line i messed something up and found myself in the following situation
i have Android cardhu-user bootloader <1.00 e> released by "ww_epad-10.6.1.27.1-20130711
and at that poiint i also had TWRP recovery 2.6.3 installed
No OS, the tablet dropped straight into recovery mode.
TWRP recovery 2.6.3 was asking me for a password. i have never had a password on this machine and TWRP was not previously asking for this prior to my attempt at installing zombipop.
if i cancel that request then i can't mount any storage in order to try install anything further. The internal file structure is there but it's not showing any files
"Storage: internal storage (0MB)
i cannot enter sideload mode
Errors read: cannot find partition size for /misc / staging /data /boot /recovery
and cannot mount cache.
i assume files are there but are encrypted and cannot be accessed without password
Back in bootloader mode, with fastboot i then tried to flash TWRP 2.8.5.1 blob file ( which i have subsequently found on another site) which i was able to do.
and after getting into that it was no longer asking me for a password but
i can't do a factory reset ( wipe, data, cach and dalvik) prior to trying to flash a new ROM. i just get a load of errors about being unable to mount /system /cache and /data. this makes me wary of trying to flash anything else. it's like what ever the issue that was prompting me for a password previously, is still there. the only difference is with 2.8.5.1 i can actually mount external cards now, though i still cant start ADB sideload properly it reports unable to mount /data
Ultimately i'd like to get it on any rom greater than KitKat which was the last working CynogenMod I had. But right now i'd just settle for having it working on anything at all again.
i'd be grateful for any advice.
<update> using the advanced wipe functions in TWRP I think i have sorted the problems with the /system /cache and /data folders. they are no longer giving errors.
stopping for night now though and coming back to this tomorrow with a fresh head.
Click to expand...
Click to collapse
Is easy. You have to reset everything through fastboot, bootloader, recovery, system literally everything. Then flash stock rom to recover stock everything, like stock recovery and stock system. Then you are good to go rooting again and so on