Link to use: http://www.3gpp-message-analyser.com/decoder/nas.htm
Example message (PDU): 09015D010107919471016700000051040D91945161428518F5000031706211056480454537FD1C769FCBEEB21C1474CBEB669D6245CBC56A319B8C56C3E1623545B80D92D95CB09B0B546F8362315D0D06AAA2E58A245A5E0651CBECF2FADD06
Below you find list of steps "How to Decode" with description of each step.