Burn booloader on Seeeduino Lotus

I’ve two Seeeduino Lotus v1.0, now one of this have a problem loading sketch onto; it works, but I’m unable to upload any new sketches, I get the </s>avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x00 error<e> .

The other board it’s working like a charm.

So…I guess I’ve two options… one is that the FTDI chip is broke, or other option is that bootloader is gone.

How I can check? Or… How I can try to burn the bootloader?

Ok… based on the fact that the CPU is the same of UNO, I tried to burn the UNO bootloader with the Arduino ISP… now the Seeeduino board seems to works right.