@symj your problem is Custom pack !!!

Must use these flash files:
K800_R8BF003_FS_CENT_EUROPE_RED52

HB1-06_Generic_CDA102568_2_R4A_GENERIC_CENT_EUROPE ( or in XS++ on Customize File System select Model K800 and CDA and Region CENT_EUROPE )

K800_R8BF003_MAIN_GENERIC_WI_RED52