Document XMODEM behavior with good/bad chips about tools HOT 5 OPEN

I have this one and had no issues flashing the firmware:

Bus 003 Device 010: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port / Mobile Action MA-8910P

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I have this one and had no issues flashing the firmware:

Bus 003 Device 010: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port / Mobile Action MA-8910P

Interesting. I have this one: https://vi.aliexpress.com/item/2027583503.html - do you have something else?
Granted, I have no idea if it is an actual PL2303 or a clone IC that just pretends to be one. My IC is totally clean of any markings, so that makes me suspect it might be a clone.

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Mine is already unlisted unfortunately, but it looks like this one.

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Retry 0: NAK on sector should not be the problem, and process shall continue, on normal xmodem devices
I have exactly same looking device as yours from #6 (comment), but mine shows as
067b:2303 Prolific Technology, Inc. PL2303 Serial Port / Mobile Action MA-8910P (note additional P)
Might be difference.

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Reporting success with CP2102N Friend adapter from Adafruit web store and tio serial terminal software on Linux host.

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