My problem was described at this forum thread - https://forum.openwrt.org/viewtopic.php?id=73100 . Now, thanks to this new mode I'm finally able to successfully read the internal flash memory installed on that router, several times with matching checksums - all without desoldering! :) Hopefully it will be useful to other ISP people who don't like soldering - as the last resort option. Using CH341A it takes about 12 minutes to read in this mode. Flashing should also work - the code is almost identical - but I am going to try it a bit later when I would have slightly more free time and courage ;)
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