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Can UV5R firmware be flashed?

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WPXS472

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I thought this was a settled matter. UV5 firmware cannot be flashed. Right? Well, a certain fellow I know claims to have flashed his UV5R with some special firmware. When I asked him to point me to the place where he found it, his memory got a little fuzzy. So, what the truth about this? Can UV5-R firmware be flashed, or not? If so, how do you go about doing it? I apologize if this has already been beaten to death.
 
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nd5y

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From the schematics available on the FCC web site it looks like the UV-5R has a Elan EM78P568-44 processor.
The data sheet for it says:

I. General Description
The EM78P568 is an 8-bit RISC type microprocessor with low power, high speed CMOS technology. There are 16Kx13 bits Electrical One Time Programmable Read Only Memory (OTP-ROM) within it. It provides security bits and some One time programmable Option bits to protect the OTP memory code from any external access...

Than means you can only write to it one time and you probably can't even read the firmware from it.
 
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