My firmware (Net+OS) hangs at start, before the FTP server starts. So I cannot upload my firmware via ftp anymore. Any chance to upload new firmware via telnet or serial?
If you have a jtag you can follow the directions on your manual and download the ftp image image.bin over the debugger.
If you don’t have a jtag you can follow the directions in this knowledgebase;
https://www.digi.com/support/knowledge-base/how-to-recover-a-digi-connect-wi-me-9210-wi-em-and
I know this solution. Okay so no chance to upload firmware via telnet?
no, telnet does not allow file transfer.