I tried this, but no luck. So, I decided to wipe everything and start over. After wiping everything clean, I got the message that I didn't have an operating system installed, and I didn't have access to my main PC because I'm currently upgrading it. So, then I had to find my daughter's laptop, I downloaded the official ROM, transferred it to a flash drive, hooked it up to my Micro USB port with one of those Micro USB to female USB cable, which took about 30 minutes to find, but now I'm up and running again, using the stock ROM and not rooted.
Now I forgot how I rooted this thing before. I don't remember exactly what apps I installed, maybe autoroot, but I didn't need a PC and it installed SuperSu at the same time. Once rooted, I installed TWRP 3.0, booted into recovery and flashed Civz_P900_Lolipop.
Can someone refresh my memory out rooting my P900 without needing a PC? I think it was Chainfire's autoroot, but I don't remember exactly.
Also, have any other (more recent/up to date) ROMs been released for the tablet? I was kind tired of using Civz_P900_Lolipop and would love to have something running Marshmallow. Sorry for all the questions, but it's been a while and I would like to have a newer ROM, if it exists, and would like to avoid bricking my device. Thanks a lot for the help![/QUOTE
I am in the same boat as you, sort of. I am still running Civs rom but it has a few second lag for every action. I wipe once a month but over time it has slowed. I keep contemplating whether to return to stock or to another rom... I want to keep spen features so that's my biggest hangup.