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By dev_su
#19009 Had a similar kind of problem
ESP-01
SDK v1.1.0

compiled AT example and flashed with
Code: Select allesptool.py write_flash 0x00000 eagle.flash.bin 0x40000 eagle.irom0text.bin

device boot success. Serial output garbage. AT commands not working.

flashed with
Code: Select allesptool.py write_flash 0x40000 eagle.irom0text.bin 0x00000 eagle.flash.bin

Serial o/p says ready at baud 115200. AT commands working. A wifi access point is visible but cannot connect to it.

//edit
while this seemed working fine
Code: Select allesptool.py write_flash 0x40000 eagle.irom0text.bin 0x00000 eagle.flash.bin

when in STA mode and connecting to home router ip was not obtained and was getting disconnected after a few seconds.
then tried
Code: Select allesptool.py write_flash 0x00000 eagle.flash.bin 0x40000 eagle.irom0text.bin
esptool.py write_flash 0x00000 eagle.flash.bin

reboot between commands. Now working flawlessly.
And thank you esp03madness. I was struggling before finding this topic