07-26-2012 08:55 AM
welcome to the Polycom Community.
Only a qualified Reseller or Polycom support can change remove the battery from a 60xx or 70xx Handset.
Please contact your Polycom Reseller.
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
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08-14-2012 04:46 AM
Pardon the late answer, but I just returned from vacation.
There is unfortunately no combination of keys to perform a HW reset of the handset.
The warranty is voided if you remove the battery, so in the unlikely situation that the freeze occurs again, the only option is to wait for the handset to run out of battery.