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The Avaya Multiservice switches have two memory locations for storing the embedded switch software: APP1 and APP2. These two memory locations make it possible to store the current software in one APP location and download the new software to the other APP location.
Saving the current software in one APP location ensures that you could run this earlier version of software, if you encounter any problem with the new, downloaded software.
CAUTION: When upgrading the switch from v5.x application software to v6.0 or later, you must download v6.x to the APP2 memory location. If you download v6.x to APP1, and store v5.x software in APP2, the 6.x software is corrupted. Once v6.x software is successfully stored in APP2, you can download v6.x to APP1.
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