pogoplug mobile--help needed (1 reply)

Hello guys,
I wanted to update my uboot

 http://blog.qnology.com/2014/07/hacking-pogoplug-v4-series-4-and-mobile.html

and something went wrong. Propably I deleted uboot. :(
My pogoplug indicator doesn't blink green or red, with nor without sd card.
Is connecting via serial converter to load uboot the only solution to connect with my pogoplug ?
If so, are below converters OK for pogoplug mobile?

 http://www.ebay.com/itm/USB-To-RS232-TTL-PL2303HX-Auto-Converter-Module-Converter-Adapter-For-arduino-/180953299346?hash=item2a21a83992:g:vrcAAMXQDfdRxAaz

 http://www.ebay.com/itm/1PCS-USB-To-RS232-TTL-PL2303HX-Auto-Converter-Module-arduino-Converter-Adapter-/221897718725?hash=item33aa227bc5:g:UB0AAOSwsB9WB5nY

Thank you for your help