Patch to fix the Hitachi H1 and H2 firmware

You know the problem.
No sooner have you got hold of one of these old treasures and in full anticipation connected all your stuff to it and want to turn it on - it boots into the totally forgotten firmware.
So is Hitachi's designed masterpieces, the H1 and the H2.

The original firmware searches if a ROM cartridge is inserted in the slot 1 or 2; if no ROM cartridge is found, the firmware is executed. This sounds practical but the secondary slots are not taken into account, so if you insert a disk interface with several functions (memory expansion, Megaflash-ROM, etc.), it will not be detected and the firmware will start. This might causes a conflict.

MRC user gdx has created a patch to solve this problem once and for all.
You must replace the HN61364P ROM (IC34) from the mainboard by a 8/16K (e)eprom containing the patched firmware to fix this issue.

The files you need can be found at the MRC download database.

Relevant link:
Forum topic to bypass a firmware
H1 firmware fix.
H2 firmware fix