SE/30 won't boot External BlueSCSI from cold BUT will boot off drive image from system picker restart

[ComputerCompulsive]

Howdy Folks,
So my resurrected battery bombed SE/30 continues to have BlueSCSI issues but after reflowing the SCSI chip it got a little...better? betterish?
So here are the symptoms:

With the caymac BMOW rom installed If I try to boot the external BlueSCSI from a cold boot it tries to boot disk 01 (7.1) for a moment before it restarts and then tries to boot disk 02 (7.5.5) and locks up.

However, if I go into the rom disk by pressing R on restart I boot to the desktop and low and behold all of my harddisk images are loaded, accessible, can be read from and written to. I can even use system picker and tell it to restart into Mac OS 7.1 (disk 01) and it will do it without any issues. I can play games I can can open utilities I even ran snooper from the bluescsi image and it reports no errors.

But as soon as I turn off the system, wait a few seconds, and switch back on I once again cannot boot from the BlueSCSI External (edit: actually it does this from the internal bluescsi too). If I turn off and on the system fast enough it will actually boot off the bluescsi without issues.

Any ideas where I should look? Am I better off just taking the whole scsi chip off cleaning and resoldering?

Any advice appreciated.

 

[YMK]

You need a hacked version of System 7.5.5 to work with the BMOW ROM and a good battery to maintain the selected boot volume.

 

[ComputerCompulsive]

You need a hacked version of System 7.5.5 to work with the BMOW ROM and a good battery to maintain the selected boot volume.

Dude you are a lifesaver! I just switched over to the original rom and a known working 7.1 image and it booted from internal disk first try!

I would have kept chasing my tail if you hadn't pointed this out so THANK YOU!

 

[Nixontheknight]

You need a hacked version of System 7.5.5 to work with the BMOW ROM and a good battery to maintain the selected boot volume.

does the same have to be done with 7.6 and 7.6.1? I know some hacking has to be done for OS 8 and 8.1 to boot, but what about the two other versions of system 7?

 

[bakkus]

does the same have to be done with 7.6 and 7.6.1? I know some hacking has to be done for OS 8 and 8.1 to boot, but what about the two other versions of system 7?

Similar hacks are required, according to BMOW: https://www.bigmessowires.com/mac-se30-with-upgraded-rom/