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There are different versions of ROMs. You have to look, which version you have. And the plus ROMs are split into two files (high and low). Here you can find two windows programs to split and compare roms. https://68kmla.org/bb/index.php?threads/software-for-roms.32011/

A 01 error means that there is a ROM error. Plus ROMs are sometimes defect. You can burn new ROMs with an eprom burner. https://www.instructables.com/Create-Macintosh-Plus-ROMs/

This site may be of interest for you. There is a part about serial connection: http://www.applefool.com/se30/#serialdata The third cable could be, what you need: http://www.applefool.com/se30/images/img/1yq5cpr6.png File-Sharing: https://www.jagshouse.com/filesharing.html

Mac Classic & SE from Larry Pina could help you. Perhaps you send me a PM?

When the classic boots with another LB then your problem is the LB and not the AB. Did you wash the board, when you recapped it? The fluid of the caps must be removed. You can use a toothbrush and water with a little bit of soap. Then rinse the board with IPA and let it dry. I use an oven at...

Did you recap the logic board? Did you measure the voltages at the floppy port (5 & 12 volt)? Did you recap the analog board? Most often a recap solves problems with the classic. If the ROM is defect you can buy a battery bombed board and use that ROM. Or you can burn a new one...

Voltages are ok, perhaps you could measure with an oszilloscop, if they are stable? But when you recapped the AB, they should be stable. Are there chips that are getting hot? Could be a temperature problem when the SE freezes after some time.

Did you measure the voltages at the floppy port? Should be 5 and 12 volt. Did you clean and reseat the ROM?

I dry my washed boards in an oven at 50-60°C for half an hour.

Here you can find some images for the bluescsi with OS, which should work: https://www.savagetaylor.com/downloads/downloads-macintosh/

https://68kmla.org/bb/index.php?threads/bother-with-recapping-floppy-drives.43876/

I do not know, if it helps, but in this thread (last post) there is another adapter (for one 27C010): https://forum.vcfed.org/index.php?threads/macintosh-se-broken-rom-low-chip.60566/ There are two 4.7kOhm Resistors used to connect the 5V to VPP, PGM and OE. I think that this is used in the...

Here someone described a zero track alignment procedure that worked for him. https://tinkerdifferent.com/threads/superdrive-floppy-maintenance.549/page-2 I have the same problems with some drives. So I am interested if you have a solution for your problem.

The dead mac scrolls: Page 46-48 https://cdn.hackaday.io/files/1681007191990400/The_Dead_Mac_Scrolls_1992-1.pdf

Could be a cracked solder joint. https://macgui.com/news/article.php?t=515 Or L2, C1 https://www.jagshouse.com/vertical.html

You should recap the AB and the PSU too. The caps leak and damage the boards.

A SD card can be used as a scsi drive for example with: - SCSI2SD - MACSD - BlueSCSI - ZuluSCSI - RaSCSI, now PiSCSI Or you build your own TashTwenty (emulates a HD20 at the floppy port). https://68kmla.org/bb/index.php?threads/tashtwenty-single-chip-dcd-hard-disk-20-interface.39357/

Perhaps you should buy a floppy emu with the software SD. It is an easy way to transfer software to the mac. https://www.bigmessowires.com/floppy-emu/

You should recap the Logic board (LB). The caps leak and may damage the LB. And remove the battery. The analog board and the power supply could also need a recap. The voltages are ok so far as the computer tries to boot. But you can check them at the floppy port. Should be 5 and 12 Volt. For...

Did you measure the voltages? Perhaps they are lower at the 5010? Is the AB recapped?