>I can boot it from hard disk using the BIOS from a v1 I-Opener.
OK, you can then load that hard disk with just about any combination of DOS and Linux partitions with all the tools you could possibly need - say awdflash, fdisk, fips, dolly, ghost, drive image, partition magic, etc.
>I would like to re-write the flash with a v2 QNX including qnxflash 1.02 so that I can get the v3 BIOS to boot the disk.
You would like to rewrite the *Sandisk* image. This just requires standard utilities like fdisk, dolly, dd, and so on, not awdflash, which is used to flash the *BIOS*.
As has been pointed out, this is a really roundabout route to get a hacked IO. If you're careful, you can simply hot-flash the v3 BIOS chip that you have with a v1 BIOS image by booting into DOS with the v1 BIOS, hot-swapping it out with the v3 BIOS ROM, and flashing the v3 into a v1 with awdflash.
This requires extreme care to ensure that you don't end with a dead IO and two dead BIOS chips.
After that, you can upgrade to v5pmi or whatever the latest and greatest BIOS version is, without any risk.