How to tell if I successfully flashed sonoff?

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I’m trying to flash a sonoff basic with espeasy. I’m on a mac and using esptool.py and a beefy3 FTDI. Here is my command:

esptool.py --port /dev/cu.usbserial-DN02TBMK write_flash 0x1000 ESPEasy_R120_1024.bin
It seems to work:

esptool.py v2.0
Connecting....
Detecting chip type... ESP8266
Chip is ESP8266
Uploading stub...
Running stub...
Stub running...
Configuring flash size...
Auto-detected Flash size: 1MB
Compressed 411264 bytes to 278756...
Wrote 411264 bytes (278756 compressed) at 0x00001000 in 24.9 seconds (effective 132.4 kbit/s)...
Hash of data verified.

Leaving...

Hard resetting…
After this nothing seems to work though. I have tried rebooting it again by pulling out the usb and putting it in again and also re-flashing it. But the led is not flashing and I can’t see the wifi esp0 or any other new wifi for that matter.

Can I somehow tell where things went wrong? Should the led flash? What might cause this problem?

Sometimes the sonoff are wrongly labeled. I had to invert RX and TX to make it work…