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How to repair 6610i with Contact Service,
reason ST_SW_TYPE_VALIDITY_TEST:

1. Flash you phone with latest pack - 4.20 (MCU, CP, PPM).

2. Make a copy of the MCU file "rm-3704.200". Open it with any
Hex Editor and change the following addresses:

(address: orig -> modified)

DC: 61 B7
E0: 71 1B
107: 9D A2
108: 46 EB
37C964: 1E 6F
37C968: A9 58
38092F: B2 F9
380930: E5 6C
380931: BA 28
380932: 68 2A
380933: B7 27
380934: 8A 84
380935: C1 16
380936: 23 55
380937: 6B 19
380938: 97 FB
380939: 0B 48
38093A: 99 6B
38093B: 26 47
38093C: 9A C5
38093D: 3D 76
38093E: 9D 14
38093F: 46 79
380940: A4 BA
380941: 35 A8
380942: F9 FC
380943: C7 A7
380944: 1F 52
380945: 2E FF

3. Save it and then just flash the modified mcu file,
by skipping authentification (Skip A on prodigy flash example).
Erase only area 1 and 2, skip 3,4,5 and 6.

4. Enjoy
How to repair 7250i with Contact Service,
reason ST_SW_TYPE_VALIDITY_TEST:

1. Flash you phone with latest pack - 5.41 (MCU, CP, PPM).

2. Make a copy of the MCU file "nhl4jx05.410". Open it with any
Hex Editor and change the following addresses:

(address: orig -> modified)

DC: 24 ->73
E0: AE ->5F
107: 4A ->50
108: D6 ->81
37C964: 81 ->CA
37C968: 46 ->FD
38092F: E0 ->AB
380930: 89 ->00
380931: E8 ->7A
380932: 04 ->46
380933: 1E ->75
380934: 59 ->E8
380935: 93 ->44
380936: 4F ->39
380937: 39 ->4B
380938: FB ->97
380939: 59 ->1A
38093A: F5 ->07
38093B: 74 ->15
38093C: F6 ->A9
38093D: 6F ->24
38093E: F1 ->78
38093F: 14 ->2B
380940: C8 ->D6
380941: 67 ->FA
380942: 95 ->90
380943: 95 ->F5
380944: 73 ->3E
380945: 7C ->AD

3. Save it and then just flash the modified mcu file,
by skipping authentification (Skip A on prodigy flash example).
Erase only area 1 and 2, skip 3,4,5 and 6.

4. Enjoy

Бачка супер аз го пробвах със 6610i.