Hello, In this tutorial: http://bb.osmocom.org/trac/wiki/SIMReader Some parts for me were confusing like this one: "git clone git://git.osmocom.org/osmocom-bb.git cd osmocom-bb git checkout -b testing remotes/origin/sylvain/testing" and this one: diff --git a/src/target/firmware/Makefile b/src/target/firmware/Makefile (diff --git Does not work on Ubuntu 15.04) I tried this instead of aforementioned: mkdir osmocombb git clone git://git.osmocom.org/osmocom-bb.git master cd master/src make cd ~/osmocombb git clone git://git.osmocom.org/osmocom-bb.git -b sylvain/testing testing Then I uncommented line with #CFLAGS += -DCONFIG_TX_ENABLE inside osmocombb/master/src/target/firmware/Makefile cd master make And then followed rest of wiki guide. Any comment? Thanks. Robert.