Well done ! But I think your previous OS AS-PRIMA_ARM-SLC-V1.53 could'nt be an english version did'nt it ? I never had bluetooth problems with EN versions of V1.48, V1.50, V1.51 and V1.53. Top up to date version is EN....V1.55 There are also Microsoft WinCE updates included and that's why it can be installed only by format complete flash memory at the same time. Attention: The format command is included directly into the OS update. You MUST backup complete device NAND FLASH and StaticStore BEFORE starting the OS update ! After update has finished restore these two backups again.