[HD2 Android Q&A, Help & Troubleshooting and Genera] Franck78:
well, I'l sure now that the offset [40...45] have a macaddress.

problem is how is it unique....

If you read this code you will see that when the Nand is blank, a default macaddress of 00:90:4C:C5:00:34 is created.

ROM:95043CC8 @ =============== S U B R O U T I N E =======================================
ROM:95043CC8
ROM:95043CC8 @ 1 initdata
ROM:95043CC8 @ 0 displaydata
ROM:95043CC8
ROM:95043CC8 eMapiCheckWlanDataValidity: @ CODE XREF: StartupSequence+3Cp
ROM:95043CC8 @ Emapitest:loc_9502020Cp
ROM:95043CC8 @ DATA XREF: ...
ROM:95043CC8
ROM:95043CC8 var_30 = -0x30
ROM:95043CC8 var_2C = -0x2C
ROM:95043CC8 var_28 = -0x28
ROM:95043CC8
ROM:95043CC8 STMFD SP!, {R4-R11,LR}
ROM:95043CCC SUB SP, SP, #0xC
ROM:95043CD0 MOV R4, R0
ROM:95043CD4 LDR R0, =WlanBlock
ROM:95043CD8 MOV R5, #0
ROM:95043CDC BL GetWLANblock
ROM:95043CE0 BL CheckSignature
ROM:95043CE4 LDR R7, =0xEE4329
ROM:95043CE8 MOV R6, R0
ROM:95043CEC CMP R4, #0
ROM:95043CF0 BNE _InitData
ROM:95043CF4 LDR R3, [R6]
ROM:95043CF8 CMP R3, R7
ROM:95043CFC BNE _InitData
ROM:95043D00 LDR R3, [R6,#4]
ROM:95043D04 CMP R3, #0
ROM:95043D08 BEQ _err_invalid_update
ROM:95043D0C LDR R3, [R6,#8]
ROM:95043D10 CMP R3, #0
ROM:95043D14 BEQ _err_invalid_update
ROM:95043D18 LDR R2, [R6,#0xC]
ROM:95043D1C CMP R2, #0x7C0
ROM:95043D20 BLS loc_95043D30
ROM:95043D24
ROM:95043D24 _err_invalid_body_size: @ "[eMapiCheckWlanDataValidity] Invalid bo"...
ROM:95043D24 LDR R0, =aEmapicheckwlan
ROM:95043D28 BL print
ROM:95043D2C B _end
ROM:95043D30 @ ---------------------------------------------------------------------------
ROM:95043D30
ROM:95043D30 loc_95043D30: @ CODE XREF: eMapiCheckWlanDataValidity+58j
ROM:95043D30 AND R3, R2, #3
ROM:95043D34 SUB R3, R2, R3
ROM:95043D38 ADD R1, R3, #4
ROM:95043D3C MOV R2, #0
ROM:95043D40 ADD R0, R6, #0x40
ROM:95043D44 BL GetRamCrc
ROM:95043D48 LDR R3, [R6,#0x10]
ROM:95043D4C CMP R0, R3
ROM:95043D50 BEQ _DisplayData
ROM:95043D54
ROM:95043D54 _err_checsum_invalid: @ "[eMapiCheckWlanDataValidity] CheckSum e"...
ROM:95043D54 LDR R0, =aEmapicheckwl_0
ROM:95043D58 BL print
ROM:95043D5C B _end
ROM:95043D60 @ ---------------------------------------------------------------------------
ROM:95043D60
ROM:95043D60 _DisplayData: @ CODE XREF: eMapiCheckWlanDataValidity+88j
ROM:95043D60 LDR R0, =aWlanDataHeader @ "Wlan data header ++++++++++++++++++++\n"
ROM:95043D64 BL print
ROM:95043D68 LDR R1, [R6]
ROM:95043D6C LDR R0, =aSignature0xX @ "Signature : 0x%x\n"
ROM:95043D70 BL printf
ROM:95043D74 LDR R1, [R6,#4]
ROM:95043D78 LDR R0, =aUpdatestatus0x @ "UpdateStatus : 0x%x\n"
ROM:95043D7C BL printf
ROM:95043D80 LDR R1, [R6,#8]
ROM:95043D84 LDR R0, =aUpdatecount0xX @ "UpdateCount : 0x%x\n"
ROM:95043D88 BL printf
ROM:95043D8C LDR R1, [R6,#0xC]
ROM:95043D90 LDR R0, =aBodylength0xX @ "BodyLength : 0x%x\n"
ROM:95043D94 BL printf
ROM:95043D98 LDR R1, [R6,#0x10]
ROM:95043D9C LDR R0, =aBodycrc0xX @ "BodyCRC : 0x%x\n"
ROM:95043DA0 BL printf
ROM:95043DA4 LDR R1, [R6,#0x14]
ROM:95043DA8 LDR R0, =aAdieid00xX @ "aDieId(0) : 0x%x\n"
ROM:95043DAC BL printf
ROM:95043DB0 LDR R1, [R6,#0x18]
ROM:95043DB4 LDR R0, =aAdieid10xX @ "aDieId(1) : 0x%x\n"
ROM:95043DB8 BL printf
ROM:95043DBC LDR R1, [R6,#0x1C]
ROM:95043DC0 LDR R0, =aAdieid20xX @ "aDieId(2) : 0x%x\n"
ROM:95043DC4 BL printf
ROM:95043DC8 LDR R1, [R6,#0x20]
ROM:95043DCC LDR R0, =aAdieid30xX @ "aDieId(3) : 0x%x\n"
ROM:95043DD0 BL printf
ROM:95043DD4 LDR R1, [R6,#0x24]
ROM:95043DD8 LDR R0, =aCountryid0xX @ "countryID : 0x%x\n"
ROM:95043DDC BL printf
ROM:95043DE0 LDRB LR, [R6,#45]
ROM:95043DE4 LDRB R4, [R6,#44]
ROM:95043DE8 LDRB R5, [R6,#43]
ROM:95043DEC LDRB R3, [R6,#42]
ROM:95043DF0 LDRB R2, [R6,#41]
ROM:95043DF4 LDRB R1, [R6,#40]
ROM:95043DF8 LDR R0, =aMacBBBBBB @ "MAC= %B %B %B %B %B %B\r\n "
ROM:95043DFC STR LR, [SP,#0x30+var_28]
ROM:95043E00 STR R4, [SP,#0x30+var_2C]
ROM:95043E04 STR R5, [SP,#0x30+var_30]
ROM:95043E08 BL printf
ROM:95043E0C LDR R0, =aWlanDataHead_0 @ "Wlan data header ----------------------"...
ROM:95043E10
ROM:95043E10 _ok: @ CODE XREF: eMapiCheckWlanDataValidity+1F4j
ROM:95043E10 BL print
ROM:95043E14 MOV R5, #1
ROM:95043E18 B _end
ROM:95043E1C @ ---------------------------------------------------------------------------
ROM:95043E1C
ROM:95043E1C _err_invalid_update: @ CODE XREF: eMapiCheckWlanDataValidity+40j
ROM:95043E1C @ eMapiCheckWlanDataValidity+4Cj
ROM:95043E1C LDR R0, =aEmapicheckwl_1 @ "[eMapiCheckWlanDataValidity] Invalid up"...
ROM:95043E20 BL print
ROM:95043E24 B _end
ROM:95043E28 @ ---------------------------------------------------------------------------
ROM:95043E28
ROM:95043E28 _InitData: @ CODE XREF: eMapiCheckWlanDataValidity+28j
ROM:95043E28 @ eMapiCheckWlanDataValidity+34j
ROM:95043E28 MOV R2, #0x800 @ Count
ROM:95043E2C MOV R1, #0 @ char
ROM:95043E30 MOV R0, R6 @ int
ROM:95043E34 BL fillchar
ROM:95043E38
ROM:95043E38
ROM:95043E38 MOV R3, #0x238
ROM:95043E3C LDR R1, =unk_97901318
ROM:95043E40 ORR R3, R3, #2
ROM:95043E44 MOV R5, #0x10
ROM:95043E48 MOV R8, #0x90 @ '�'
ROM:95043E4C MOV R9, #0x4C @ 'L'
ROM:95043E50 MOV R10, #0xC5 @ '+'
ROM:95043E54 MOV R11, #0x34 @ '4'
ROM:95043E58 MOV LR, #1
ROM:95043E5C MOV R4, #0
ROM:95043E60 MOV R2, R3
ROM:95043E64 ADD R0, R6, #0x40
ROM:95043E68 STMIA R6, {R7,LR}
ROM:95043E6C STR LR, [R6,#8]
ROM:95043E70 STR R3, [R6,#0xC]
ROM:95043E74 STR R5, [R6,#0x24]
ROM:95043E78 STRB R4, [R6,#0x28]
ROM:95043E7C STRB R8, [R6,#0x29]
ROM:95043E80 STRB R9, [R6,#0x2A]
ROM:95043E84 STRB R10, [R6,#0x2B]
ROM:95043E88 STRB R4, [R6,#0x2C]
ROM:95043E8C STRB R11, [R6,#0x2D]
ROM:95043E90 BL memcpy
ROM:95043E94 MOV R2, #0
ROM:95043E98 MOV R1, #0x23C
ROM:95043E9C ADD R0, R6, #0x40
ROM:95043EA0 BL GetRamCrc
ROM:95043EA4 MOV R3, R0
ROM:95043EA8 MOV R0, R6
ROM:95043EAC STR R3, [R6,#0x10]
ROM:95043EB0 BL callNAND_WriteConfig
ROM:95043EB4 CMP R0, #0
ROM:95043EB8 LDRNE R0, =aInitializeWlan @ "Initialize wlan data success\n"
ROM:95043EBC BNE _ok
ROM:95043EC0
ROM:95043EC0 _err_init_failed: @ "Initialize wlan data fail\n\n"
ROM:95043EC0 LDR R0, =aInitializeWl_0
ROM:95043EC4 BL print
ROM:95043EC8 MOV R5, #0
ROM:95043ECC
ROM:95043ECC _end: @ CODE XREF: eMapiCheckWlanDataValidity+64j
ROM:95043ECC @ eMapiCheckWlanDataValidity+94j ...
ROM:95043ECC MOV R0, R5
ROM:95043ED0 ADD SP, SP, #0xC
ROM:95043ED4 LDMFD SP!, {R4-R11,LR}
ROM:95043ED8 BX LR