ZyXEL U-90E User Guide - Page 132

Kernel Recovery Mode, ATUPX

Get ZyXEL U-90E PDF manuals and user guides View all ZyXEL U-90E manuals
Add to My Manuals
Save this manual to your list of manuals

Page 132 highlights

U-90E Data/Fax Modem 14.2 Kernel Recovery Mode Your modem is equipped with ZyXEL's exclusive Kernel Recovery Mode. This unique feature enables quick recovery from failed flash uploads. With other modems, a failed flash upload usually results in the user having to return the modem to the factory for repair. In the unlikely event that your modem fails to respond to AT commands after upgrading the flash EPROM: 1. Turn off the modem. 2. Press the D/V button while turning on the modem, then release the button after 5 seconds. A Kernel Program responsible for the update process takes control of the modem. It accepts a limited set of AT commands, including the ATUPX command. 3. Repeat steps 1-9 from the previous directions above to upload a file that contains the valid firmware for your modem. 14-2 Upgrading Your Modem

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128
  • 129
  • 130
  • 131
  • 132
  • 133
  • 134
  • 135
  • 136
  • 137
  • 138
  • 139
  • 140
  • 141
  • 142
  • 143
  • 144
  • 145
  • 146
  • 147
  • 148
  • 149
  • 150
U-90E Data/Fax Modem
14.2 Kernel Recovery Mode
Your modem is equipped with ZyXEL’s exclusive
Kernel Recovery Mode.
This unique feature
enables quick recovery from failed flash uploads. With other modems, a failed flash upload usually
results in the user having to return the modem to the factory for repair.
In the unlikely event that your modem fails to respond to
AT
commands after upgrading the flash
EPROM:
1.
Turn off the modem.
2.
Press the D/V button while turning on the modem, then release the button after 5
seconds.
A Kernel Program responsible for the update process takes control of the modem. It
accepts a limited set of
AT
commands, including the
ATUPX
command.
3.
Repeat steps 1-9 from the previous directions above to upload a file that contains the
valid firmware for your modem.
Upgrading Your Modem
14-2