1.open medusa software select LG tab and select model GT540
2.click help for jtag pinout and click easy repair
3.click next
4.use power supply or usb cable to power the device and click repair
5.disolder jtag pinout
6.reconnect battery, press and hold volume down,up and power key to download mode
7.run octopus sofware and select model gt540
8.select firmware and tick write firmware
9.after flash airplane mode only
.... solutioN tick REPAIR NVM
2.click help for jtag pinout and click easy repair
3.click next
4.use power supply or usb cable to power the device and click repair
5.disolder jtag pinout
6.reconnect battery, press and hold volume down,up and power key to download mode
7.run octopus sofware and select model gt540
8.select firmware and tick write firmware
9.after flash airplane mode only