[Nexus 7 Q&A, Help & Troubleshooting] KMDDesign:
I have just used Wug's Toolkit to "Flash Stock + Unroot"

Below is th terminal output:

Flash Stock + Unroot...
--------------------------------------------------------------

erasing 'boot'...
OKAY [ 0.020s]
finished. total time: 0.020s
******** Did you mean to fastboot format this partition?
erasing 'cache'...
OKAY [ 0.020s]
finished. total time: 0.020s
erasing 'recovery'...
OKAY [ 0.020s]
finished. total time: 0.020s
******** Did you mean to fastboot format this partition?
erasing 'system'...
OKAY [ 0.020s]
finished. total time: 0.020s
******** Did you mean to fastboot format this partition?
erasing 'userdata'...
OKAY [ 0.030s]
finished. total time: 0.030s

sending 'bootloader' (2096 KB)...
OKAY [ 0.270s]
writing 'bootloader'...
OKAY [ 0.590s]
finished. total time: 0.860s
rebooting into bootloader...
OKAY [ 0.020s]
finished. total time: 0.020s

archive does not contain 'boot.sig'
archive does not contain 'recovery.sig'
archive does not contain 'system.sig'
--------------------------------------------
Bootloader Version...: 4.18
Baseband Version.....: N/A
Serial Number........: 015d21d914481613
--------------------------------------------
checking product...
OKAY [ 0.040s]
checking version-bootloader...
OKAY [ 0.020s]
sending 'boot' (4944 KB)...
OKAY [ 0.610s]
writing 'boot'...
OKAY [ 0.160s]
sending 'recovery' (5446 KB)...
OKAY [ 0.670s]
writing 'recovery'...
OKAY [ 0.180s]
erasing 'system'...
OKAY [ 0.020s]
sending 'system' (471804 KB)...
OKAY [ 55.586s]
writing 'system'...
OKAY [ 20.822s]
erasing 'userdata'...
OKAY [ 0.030s]
formatting 'userdata' partition...
Creating filesystem with parameters:
Size: 14442037248
Block size: 4096
Blocks per group: 32768
Inodes per group: 8176
Inode size: 256
Journal blocks: 32768
Label:
Blocks: 3525888
Block groups: 108
Reserved block group size: 863
Created filesystem with 11/883008 inodes and 96825/3525888 bloc
sending 'userdata' (137526 KB)...
writing 'userdata'...
OKAY [ 24.063s]
erasing 'cache'...
OKAY [ 0.010s]
formatting 'cache' partition...
Creating filesystem with parameters:
Size: 464519168
Block size: 4096
Blocks per group: 32768
Inodes per group: 7088
Inode size: 256
Journal blocks: 1772
Label:
Blocks: 113408
Block groups: 4
Reserved block group size: 31
Created filesystem with 11/28352 inodes and 3654/113408 blocks
sending 'cache' (9052 KB)...
writing 'cache'...
OKAY [ 1.580s]
rebooting...

finished. total time: 103.951s

Booting up your freshly flashed stock device...
--------------------------------------------------------------

Wait for your device to finish booting up...

- It may appear to be boot looping; just wait...

- It could take 5-10 minutes; please be patient...

When its finally booted back up, please remember
to re-enable USB debugging if you plan on using
the toolkit to perform other operations.

NOTE: If this process was too quick and your device
is still in bootloader mode, then flashing stock may
have failed or been incomplete. Simply check the
log above: if you notice it skipped steps because it
didn't meet certain requirements, like the bootloader
or baseband version, then consider enabling 'Force Flash'
mode in the toolkits options menu and trying the
'Flash Stock + Unroot' processs again. Cheers.

Press any key to exit...

I used the same stock rom I am using so I ddn't have to flash the bootloader which is an issue (see above).

I can't see any errors in that terminal, everything looks fine but when the tablet reboots it has not changed a single thing!! Multirom is still there as it was and my old rom and userdata and everything down to the crappy wallpaper I put on 8 months ago is still there!!

Can anyone PLEASE HELP!!!