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Unable to Downgrade AP Firmware

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TitleUnable to Downgrade AP Firmware
Question
Why am I unable to downgrade the firmware on the AP8132?
Why am I unable to downgrade the firmware on the AP8122?
Why am I unable to downgrade the firmware on the AP8232?
Why am I unable to downgrade the firmware on the AP8222? 
Environment
Answer
A new NAND chip has been qualified and will be rolled into manufacturing when the existing NAND quantities run out. To support the new NAND chip, updated SW is required. The recently released WiNG 5.5.2 adds this support. All APs manufactured with the new NAND will have WiNG 5.5.2 pre­loaded on them. 

WiNG 5.5.2 software prevents SW downgrades on any AP's where the new NAND is detected since earlier versions of code will not function correctly with the new NAND installed.

Note The following AP models are impacted by this NAND change. As HW revision levels can vary by SKU, the anticipated Rev level for units with the new NAND is listed for assistance in easily identifying a unit that has a new vs. an old NAND.

   
Part Number DescriptionRev Level
with
new NAND
SW with new NAND support 
AP-8132-66040-USAP 8132 3x3:3 802.11n
External antenna US SKU
CWiNG 5.5.2 or later
AP-8132-66040-EUAP 8132 3x3:3 802.11n
External antenna EU SKU
BWiNG 5.5.2 or later
AP-8132-66040-WRAP 8132 3x3:3 802.11n
External antenna WR SKU
EWiNG 5.5.2 or later
AP-8122-66030-USAP 8122 3x3:3 802.11n
Internal antenna US SKU
BWiNG 5.5.2 or later
AP-8122-66030-EUAP 8122 3x3:3 802.11n
Internal antenna EU SKU
BWiNG 5.5.2 or later
AP-8122-66030-WRAP 8122 3x3:3 802.11n
Internal antenna WR SKU
BWiNG 5.5.2 or later
AP-8232-66040-USAP 8232 3x3:3 802.11ac/n
External antenna US SKU
BWiNG 5.5.2 or later
AP-8232-66040-EUAP 8232 3x3:3 802.11 ac/n
External antenna EU SKU
BWiNG 5.5.2 or later
AP-8232-66040-WRAP 8232 3x3:3 802.11 ac/n
External antenna WR SKU
CWiNG 5.5.2 or later
AP-8222-66030-USAP-8222 3x3:3 802.11 ac/n
Internal antenna US SKU
CWiNG 5.5.2 or later
AP-8222-66030-EUAP-8222 3x3:3 802.11 ac/n
Internal antenna EU SKU
BWiNG 5.5.2 or later
AP-8222-66030-WRAP-8222 3x3:3 802.11 ac/n
Internal antenna WR SKU
CWiNG 5.5.2 or later
Additional notes
Article transferred from Zebra WLAN site

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