GPRS decode tutorial

[Dario Lombardo]

Hello everybody
Not sure if someone has pointed it out already, but I'm getting stuck
following the gprs decode tutorial

[...]

- Prepare OsmocomBB's burst_ind branch

  cd ~/gprs_sniffer/osmocom-bb
  git checkout origin/sylvain/burst_ind
  git checkout d1cb8ea9b784c7acbafbb2fdcedbdf4655c2f6f5

At this point I get

fatal: reference is not a tree: d1cb8ea9b784c7acbafbb2fdcedbdf4655c2f6f5


Next step fails too... pretty obvious...

# patch -p1 < ~/gprs_sniffer/gprs_multi.patch
can't find file to patch at input line 5
[...]

Can someone drive me to the right direction?
Thanks!
Dario
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