If I am understanding your request correctly, The steps for upgrading are real simple. The software is located at: https://support.cambiumnetworks.com/admin/files/ptp650 Once downloaded, on the PTP650 go to System > Software Upgrade, which it will prompt you for the file.
As far as stability it is recommended both radios are at the same software version for best stability.
As for the default license I am not quite sure what the request is for. If it is for country, you should always use the your country as it will have the regulatory settings of that country. If you use other, you will need to be more diligant to make sure your following your areas regulations.
hi we bought PTP 650 But one of them has 50650-01-11 firmware and the other has 50650-01-40 they are failing to work,how do i rectify this and when i try to go on firmware download link its saying permision denied kindly help regards Larkson