Camera shows flashing H in rear screen and won't wind on film

Unfortunately on your model the flashing H means there's an electrical fault which needs repair.

In practice, it's an old obsolete model and few spare parts will be available. Any kind of professional repair will cost far more than the camera is worth. But as almost all 35mm compacts are now virtually worthless it means that you can get fantastic models for free or very cheap. All of mine have come for free via FreeCycle, Freegle, and by just asking people I know as most have unused and unwanted cameras lying around. Even the superb and very under-rated Canon Sureshot Classic 120 which has one of the sharpest lenses ever put onto a 35mm compact can be had for zilch as the batteries cost more than the camera is worth (new batteries: about £10).

Sorry this is not the answer you hoped for, but I hope that it enables you to fix the problem in a different way at almost no cost.