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Ralph Mowery

In article ,
says...

Repairing these boards is maybe impossible, but I'm investigating
options. The 2 main problems that would have to be solved a

1. Remove CPU from board. (CPU doesn't need to survive, but board does.)
Heat gun? (Might damage surrounding components.)
Solder bath? (Might unsolder surrounding components.)
Cut pins? (Might damage traces.)
OTHER???

Can't help with the programming.

To remove the chip, a hot air gun is the way to go. There are 2 ways to
help keep the air where it is wanted. Special tips that are just large
enough to blow the hot air on the pins. Use some kapton tape over areas
where you do not want the hot air. It is usually like an amber colored
celophane tape and is heat resistant.

It depends on your budget and how many boards you plan on working on.
There is some hot air stations on ebay for around $ 60 that may get the
job done. There are better ones that are a couple of hundred bucks.
Having a good stereo microscope helps. An Amscope se400z scope with 10x
lenses is very good for the price at around $ 200.

There are plenty of youtube videos that show how to do it. Just get
some old computer boards with smd on them and practice. Plenty of flux
is one of the better tips.

Plan on spending around $ 350 to $ 400 to get the minimum equipment
needed to do a decent job.
The microscope and hot air station is the most.