[Elecraft] Updates to Reverting Firmware

[David Ferrington, M0XDF]

K6KR (author of the K3 utility) kindly pointed out a few things :-)

The content of the page (<http://www.zerobeat.net/mediawiki/index.php/Firmware_Reverting 
 >) as previous posted was correct in all respects except it didn't do  
anything if you didn't have 'Advanced Mode' on (If you don't, the only  
send button is "send all new", and that button is disabled if the  
version in the radio is >= the file firmware version).

I have added that step and some more info on file content and  
versioning.
Apologies to anyone who's been trying to make this work and wondering  
what they were doing wrong.
-- 
73 de M0XDF / K3 #174