Bevore you do anything i recommend to read the thread on RC Groups:
Read the Description Carfully! You do all at your own risk!
This Video show how to Flash the Imax B6 Charger to get the Menu 1 (Stop and Incrase Button Press/Hold at Start up) Back to Calibrate the Individual Cell Voltage of the Imax B6
The Informations in the Video came mostly from RC Grous Thread:
http://www.rcgroups.com/forums/showthread.php?t=827821&page=12 start from Post 177
Also the Hex File: (you need to Register before you can Download)
The AVR Tools for Mac
To Calibrate you need a 6S Lipo with 25.2 Volt (Full Charged each Cell to 4.2 Volts).
All this you can also Read at the RC Groups Thread
Or you make a tool like this one:
Also read my Blog: https://ripcurl777.wordpress.com
YOU DO THIS MODIFICATION AND FLASHING AT YOUR OWN RISK!
YOU NEED TO KNOW WHAT YOU DO, ESPECIALLY IN THE CASE OF AN IMAX B6 AC WICH USES
A POWERSUPPLY WITH HIGH VOLTAGE!!! THIS CAN HARM OR EVEN KILL YOU!! THERE IS NO WARRANTY FOR THESE BINARY FILES, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND ALL OTHER PARTIES PROVIDE THE BINARY “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE BINARY IS WITH YOU. SHOULD THE BINARY DIFFER OR CONTAIN ANY DEFECT, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.