I solved the problem of unreadable uboot output on my GL-MT300N-V2 using another UART adapter ( The problem is described in this thread:
UBOOT wrong serial speed? - #3 by alzhao )
On the adapter in the blue box PL2303TA - the output uboot unreadable (or nothing is output)
On the PL2303 without box - ok (TXD on adapter connect to RXO on GL-MT300N-V2
)
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