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Can't interrupt U-boot loading - goflex net (2 replies)

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First of all, thanks ,Bodhi , for your great work on providing regular update for our aging Kirkwood devices. I've been using this forum for years as a main knowledge source for tweaking my pogoplugs.
I recently acquired goflexnet with a locked ssh access and currently I am facing serious difficulties trying to flash tld u-boot over serial console.
The problem is that I can not interrupt u-boot no matter what I do. I use the latest debian rootfs on sd card plugged in device with uEnv.txt in boot directory.
I tried pretty much everything that I can think of - different usb2serial converters, switching tx – rx , different wires, tried over 3 platforms – linux, win10, winXP – same story over and over. The device boots , I see the messages, when the part comes – press any key to stop u-boot appears – I cant interrupt and get access to console to “GoFlexNet>” prompt.
The kwboot method doesn’t seem to work either.
Since I am out of ideas – any help is highly appreciated.
Thanks in advance!

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