samsung s275m not unlocking

i have done few s275m unlocked but this time i m stuck with 2 phones one is 275m and other is a157v

problem is phones are not detecting with octopus (i am a octopus dongle user) i have tried all ways but no success Welcome to Octoplus/Octopus Box Samsung software version 1.5.8

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Platform: Samsung Swift

Selected model: SGH-S275M

Selected port: COM102

Baud rate: 115200

Please, connect phone to UART cable, insert battery and press power

button for 3 seconds.

Connecting...

Connecting canceled.

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Platform: Samsung Swift

Selected model: SGH-S275M

Selected port: COM102

Baud rate: 115200

Please, connect phone to UART cable, insert battery and press power

button for 3 seconds.

Connecting...

via Welcome to gsm-tips http://ift.tt/13iBOij