Hi, For future reference, the problem described below was fixed by flashing the hardware again using the instructions found at the following link: http://umtrx.org/hardware/flashing/ From: UmTRX [mailto:umtrx-bounces@lists.osmocom.org] On Behalf Of Kea Barnes Sent: 08 April 2015 11:03 AM To: umtrx(a)lists.osmocom.org Subject: UmTRX uhd_usrp_probe command "holler protocol" error Hi, I have been following the instructions at (http://www.rs-online.com/designspark/electronics/eng/blog/running-a-gsm-net work-on-the-raspberry-pi-2) but have encountered a strange error when I run the "uhd_usrp_probe" command, stating: " linux; GNU C++ version 4.6.3; Boost_105000; UHD_003.008.002-151-gbf4f50de -- Opening a UmTRX device... 192.168.10.2 Error: RuntimeError: NotImplementedError: holler protocol not implemented " I have done a search on Google for the error but there doesn't seem to be any information on it. Do you have any idea what is causing it? Any help would be much appreciated. Should you be interested in knowing the exact commands I ran when following the instructions, let me know and I'll write them out. Regards, Kea