hi all this is my 1st post here but what a great forum basically i have my freinds black edition therion 166 here and it says check battery after a little knock while it was usb charging , i finder 167 did the same but i re installed the firmware from here and its been perfect ever since (thankyou ) , now this doesnt want to work , just says "check battery " , these are my own checked and fully charged batteries and i know they work 100% and are fine in the finder 167 please heeeeeelp much appreciated jay