? Notice what Kenwood says below for each of the firmware in the two different generation radios. The CHECKSUM you list is not shown on either. Also look carefully at the S# range of your unit as you can see the SN listed below is the STARTING RANGE of radios listed & higher to fix the issues shown.
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E2 in v.2 radios trouble code indicates "Channel data is not written." Basically the radio is saying there's no channel data written in the memory or it is corrupt/not valid.
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Model and age makes a difference as to what checksum you end up with.
