I have a US version of U820, 1.22 bios. I successfully flashed with the u2010 v1.20 bios with SLIC 2.1. which I also attached here. and activated successfully win 7.
the only trick is that when flash directly, the modded bios is based on 1.20 so Flashaid refuses to flash. I had to edit BIOSheader.ini and change BIOS_Version=0x80011600 so that FlashAid would proceeds.
since all the links in previous posts are broken. I am attaching the one i used here. I don't know who made it, I actually downloaded it from a rapidshare link posted in a chinese forum -- was prepared to brick my U820 in doing so.
before flashing the moded version, I flashed original v1.20. I am pretty sure this was not neccessary at all, but just FYI.