Merge pull request RfidResearchGroup#1916 from henrygab/patch-1

check daughterboard connection for SIM issues

doc/md/Installation_Instructions/Troubleshooting.md

@@ -135,6 +135,8 @@ See [details here](/doc/md/Use_of_Proxmark/4_Advanced-compilation-parameters.md)
 
 (RDV4 only) Make sure you've the latest SIM firmware according to the [configuration documentation](/doc/md/Use_of_Proxmark/2_Configuration-and-Verification.md#verify-sim-module-firmware-version).
 
+Check that the SIM daughterboard is properly seated onto the mainboard.  Pressure on the edges of the daughterboard could cause the connector to partially disconnect (especially good to check if problems began after installation of the bluetooth module, for example).
+
 ## Troubles with t5577 commands or MFC/iClass/T55x7 dictionaries
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