Glad it worked for you, behaviour! You just needed an SLP name added instead of SLIC. Thanks for the feedback!
The VGC-RB34G download page shows the same file name "INBSYS-00862210-US.EXE" as the VGC-RB30 download page, so it appears the bios is the same for those two models. Also this string in EV0062P.BIO_Slic_Sony matches what you have: Code: Offset 0 1 2 3 4 5 6 7 8 9 A B C D E F 000008B0 A8 C6 09 00 A8 CB 09 00 45 56 39 31 35 31 30 41 ¨Æ..¨Ë..EV91510A 000008C0 2E 30 34 54 2E 30 30 36 32 2E 32 30 30 35 2E 30 .04T.0062.2005.0 In the original Sony download EV0062P.BIO is used when flashing from DOS with iflash63.exe, and EV0062C.BIO is bundled with the Windows flash utility but the files are identical. The _Slic_Sony versions are almost identical-- only 4 checksum bytes are different and they add up to the same thing. So you can flash either one. You don't need to do both. The preferable way to flash it is from DOS with iflash63.exe.