Call me old fashioned, unknowledgable and noob; I am,
in fact, all of
them. But couldn't you just put those things in the sun?
Which was always the 'scare' when you saw a 'stickered' EPROM and the
sticker fell off, with sunlight coming in strong and heavy ;)
It's like using a refrigerator magnet to try to bulk-erase a disk.
It works great and instantly, IFF you did not want it erased.
If you WANT it to erase, it'll take forever, and never quite finish.