The ancient mediatek u-boot 1.1.3 is known to corrupt extracted kernel image when it becomes too big. I proposed a fix in this patch:
https://patchwork.ozlabs.org/project/openwrt/patch/20200414064438.1172618-1-gch981213@gmail.com/
and it needs more testing. Could someone help testing this patch on top of current OpenWrt master and see if the problem is fixed?
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