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I enable the logging, I found something interesting
70828:060038 [ 5.069795] <4>[ 6.493223] ERROR:bundle/unbundle_wario.c:1566:do_unbundle():do_unbundle: FB02 bundle could not be applied over FB03
170828:060038 [ 5.069828] <4>[ 6.493679] INFO:bundle/unbundle_wario.c:2078:unbundle():No uboot image found! skipping uboot installation.
170828:060038 [ 5.069859] <4>[ 6.493730] ERROR:update.c:262:update_os():Could not unbundle /mnt-us/update_KV_5.5.0_initial.bin,error_code=16
170828:060038 [ 5.069890] <4>[ 35.644480] /mnt-us/update_KV_5.5.0_initial.bin MD5SUM: f7c8905ea993fef902be82b70a98542a
170828:060038 [ 5.069906] <4>[ 35.644638] INFO:update.c:43:remove_file_ll():removing /mnt-us/update_KV_5.5.0_initial.bin
Seems the update_KV_5.5.0_initial.bin packaged with "recovery"(FB02) option, and seemds 5.8.10 requires "recovery2"(FB03). I wonder if the downgrade image repackaged with recovery2 option, then it may work.
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