The b version is for a newer LCD driver.
If your front panel was built with the newer LCD driver, there's a permanent mark in the radio's flash memory that the K3 Utility uses to figure out which firmware file to use. Don't try to rename files; the K3 Utility will figure it out and load the firmware file appropriate for your front panel board.
73 de Dick, K6KR
-----Original Message-----
From: Elecraft [mailto:
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Sent: Tuesday, February 24, 2015 14:40 PM
To:
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Subject: [Elecraft] K3: hmcu0510b.hex
I can see file hmcu0510b.hex
(ftp://ftp.elecraft.com/K3/firmware/hmcu0510b.hex) on ftp. This "b" version is about LCD driver as it was before (if I remember correctly)? Or...?
73!
L. ok1dst
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