Content originally posted in LPCWare by www.FreeRTOS.org on Wed Apr 29 02:17:36 MST 2015 The only thing that could cause an issue would be if LPCOpen was giving a mutex from an interrupt where things have changed - other than that you should find you can just drop the latest FreeRTOS files into your project, overwriting the previous file (back the previous files up first, naturally!).