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Please make sure you have read the below information, release notes known issues before installing this software on your device. Always install and test the software in your environment before mass deployment.

titleImportant upgrade/downgrade instructions:

Any phone running an 8.9.3.x or higher firmware should not be downgraded to a version below This may lead to a deadlock situation where the firmware works, but the phone cannot be updated anymore at all! All versions lower than are affected by this update procedure issue. Only option left to get out from such deadlock situation is to use the network recovery procedure as described in our support How-to. If the downgrade is mandatory, use the as an intermediate firmware downgrade step, before you finally install the desired/known as affected version! Please note: if you experience the deadlock situation do not open an RMA case, as this is not a hardware/flash issue!