Welcome to the forum and congrats, you found the geezer section! Yes, there are still a few of us geezer die hard Transformer fans around
Well you can practice flashing on the free tab to some extent, but the hard part has been done for you already on this one.
CWM 6 is actually fairly recent by TF101 standards and it should support flashing from your microSD card. Boot into CWM and root around under the Install menu. Check if there is an option to install from external media, like your microSD. That would make the rest of the process a lot easier! The microSD has to be fat32 which is the factory default.
The general steps to get the tablet going again:
1. You should flash a current recovery like TWRP 2.8.1. Download the latest version from here: [RECOVERY][TF101][TF101G][SL101] TWRP 2.8.1.… | Asus Eee Pad Transformer TF101
2. Then you have to format data in TWRP and if you follow my recommendation you would flash the Katshmallow rom for which you should convert the data partition to f2fs. Read this and just follow the simple steps. I wrote it for the TF700 but the steps are the same for the TF101. [GUIDE] Convert /data to f2fs with TWRP 2.8.… | Asus Transformer TF700
To summarize this step: First format data in TWRP, then convert it to f2fs
3. Read the first 3 posts from this thread very, very carefully [ROM][MM 6.0.1] [ KatKiss - KatshMallow #029… | Asus Eee Pad Transformer TF101
Then read them again.
Another time won't hurt.
Then download the rom, gapps (Google apps - and make sure you get the pico edition (pico for picolo = small, the other ones are too large for your system partition)) and supersu.
Load all the downloads on your microSD and insert it.
Boot into CWM, navigate to the microSD, select the TWRP zip file and hit "install" or "ok" or whatever it is in CWM. Then reboot the tablet. Doesn't matter that it won't boot into anything, just do it once, then boot back into recovery which miracously should be TWRP instead of CWM.
Follow the instructions from the link above to use TWRP to format /data and convert it to f2fs.
That done, in TWRP hit "Install" navigate to the microSD and flash the rom, then gapps and then supersu one after the other.
Now, if that does not leave you with a brick, you are ready to tackle the other tablet. BTW - a simple factory reset from Settings would probably help a little to speed it up again but a full format of data in TWRP is much, much better!!
And that in combo with a custom rom is the best.
So the hard part is going to be to get a custom recovery flashed to that tablet. That's what EasyFlasher is for and Frederuco's guide is still the gold standard for it: http://wwwformerforums.com/forum/asu...rom-tf101.html
The download links in that post don't work anymore which is no big surpise. So follow Frederuco's instructions to get the drivers installed, then download EasyFlasher from here: EasyFlasher - Install CWM/Root/unbrick in on… | Asus Eee Pad Transformer TF101
Extract the zip, click the exe, connect your tablet and choose the TWRP or the CWM recovery from the drop down. Flash it and reboot the tablet.
If all went well you now have a custom recovery -albeit outdated - on that tablet too.
Look above, rinse and repeat. So keep the microSD with all those files handy.
Good luck and have fun!