There is a new update for Advanced Management Module Firmware v3.54L (BPET54L) for IBM Blade Centre dated 23rd July 2010. With the apply of this updates, one of my blade server was finally rediscovered....
As for the instruction how to update, here the setup instruction
ftp://download2.boulder.ibm.com/ecc/sar/CMA/XSA/ibm_fw_amm_bpet54l_anyos_noarch.txt
IBM BladeCenter E Chassis (7967, 1881, 8677)
IBM BladeCenter H Chassis (7989, 8852)
IBM BladeCenter HT Chassis (8740, 8750)
IBM BladeCenter S Chassis (1948, 7779)
IBM BladeCenter S Express
IBM BladeCenter HC10 (7996)
IBM BladeCenter HS12 (8028, 1916, 8014)
IBM BladeCenter HS20 (8832, 1884, 8678, 8843, 7981, 1883)
IBM BladeCenter HS21 (1885, 8853, 7995)
IBM BladeCenter HS21 XM (1915, 7995)
IBM BladeCenter HS22 (7870, 1936, 7809)
IBM BladeCenter HS22V (7871, 1949)
IBM BladeCenter HS40 (8839)
IBM BladeCenter HX5 (7872, 1909)
IBM BladeCenter JS20 (8842)
IBM BladeCenter JS21 (7988, 8844)
IBM BladeCenter JS23 (7778)
IBM BladeCenter JS43 (7778)
IBM BladeCenter LS20 (8850)
IBM BladeCenter LS21 (7971)
IBM BladeCenter LS22 (7901)
IBM BladeCenter LS41 (7972)
IBM BladeCenter LS42 (7902)
IBM BladeCenter PS700 (8406)
IBM BladeCenter PS701 (8406)
IBM BladeCenter PS702 (8406)
IBM BladeCenter JS22
IBM BladeCenter QS21
IBM BladeCenter QS22
