Teleservice "Pivot" Firmware >= V11
For 900-2C5x0 devices and since firmware version 11.0, it is no more required to perform a recovery to upgrade to a major firmware version.
This major version update can be performed with a simple firmware update thanks to “Pivot firmware versions".This means that a major firmware update can also be done with "eBuddy" remotely over VPN. By "pivot firmware" we define firmware versions, that are mandatory to upgrade to, before going any higher.
If the firmware version is currently 11.2s2 and there's a wish to upgrade to v13, a first upgrade to v12 is required. Once the current firmware version is 12, then only can the upgrade to v13 be operated.
The pivot firmware is in fact all major versions. This means that firmware v12.0s0, v13.0s0, ..., v20.0s0, ... are all pivot versions. And so, to upgrade from v12 to v15, the firmware will first need to be upgraded to v13, than to v14 and finally to v15.
Be aware that a firmware recovery is still possible. If you have a local access to the eWON, then it is easier to p1erform directly an eWON recovery.Therefore you do not need to step through all different pivot firmwares. Using recovery allows you to jump directly to the latest firmware version.
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