Safe ways to upgrade?

Banana Pi Router design BPI-R3/R3 Mini(MT7986)
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Sorry for posting was very wrong topic to talk abt

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Do not try to upgrade mainline openwrt from the bpi/sdk version. Make a clean install.

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Flash image to sdcard and install to nand from uboot menu (debug uart needed).

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Ah,sorry missed that you use R3mini.

This is official instruction:

https://openwrt.org/toh/sinovoip/bananapi_bpi_r3_mini#installation_instructions_for_emmc

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