[FS#4004] mt7915e, 5GHz radio in Belkin RT3200 not showing up in r17470-43f0e386d4

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FS#4004 - mt7915e, 5GHz radio in Belkin RT3200 not showing up in r17470-43f0e386d4
User who did this - Hannu Nyman (hnyman)

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Likely related to the recent NAND flash driver update.

See the discussion onward from
https://forum.openwrt.org/t/belkin-rt3200-linksys-e8450-wifi-ax-discussion/94302/367 

Briefly: 
The OEM manufacturer has written the wifi calibration data to the flash without proper ECC correction, and while the "old flash driver" has quietly accepted that, the new flash driver chokes on it.  

The flash driver was updated roughly a week ago by @981213. Commits at :
https://git.openwrt.org/?p=openwrt/openwrt.git;a=shortlog;h=9abd2fb6c4dd3befa80a5721e7a6bc77506ac778

@dangowrt has generated a fix for the "UBI variant" of RT3200/E8450: you need to reapply his UBI recovery-installer with at least version 0.5.3. The fix is to read/write the wifi calibration data with the new driver in order to set the ECC bits.

But to my knowledge there is no direct fix for the non-UBI variant, yet.

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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=4004#comment10040

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