I'm assuming you meant Vegan ginger, right? If you just want Vegan 5.1.1, then you could stay on the 1.2 bootloader and flash Brilliant Corners. It's a 1.2 version of Vegan 5.1.1.
This is exactly why it would be nice for the 1.1 rom devs (there are only 2 that are used regularly) to update their Roms to 1.2...get rid of the confusion and people bricking their tablets becuase they feel the need to NVFlash.
The fact is, you were on 1.2 BOS and wanted to get ot a 1.1 rom...It's simple, Follow the instructions on the "foolproof flash to 4349" thread and stop once you've got 3588 installed...you'll be on a fresh install of 3588, with none of the remnents of BOS or 1.2 hanging around...start as clean as it is possible in order to avoid mistakes and problems.
If you ask me, NVFLash has been causing more and more people problems. From what I've read, it's a good tool to have IF you need to recover from a softbrick, but now EVERYONE is trying to NVFlash this, and NVFlash that...it's getting people into trouble, that they wouldn't have been in if they were sticking to CWM, or in some cases, STOCK RECOVERY.
I updated to 1.2 and flashed Brilliant corners over a week ago. I know that I can flash a version of CWM for 1.2, but I haven't yet, simply becuase I see no need to do it. I can always use stock recovery to flash a new rom, if I wanted to.