Do you have an RS232(Serial) Console Cable? You should've had that cable when you purchased the device
If you have, connect it to the SG300. Make sure to set the correct settings on your terminal software
Baud Rate:9600 bps
Data Bits:8 bits
Stop Bit:1 bits
We will try to capture the boot process and the POST of the device 1. Before turning the device off, verify if you can get console prompts 2. Now turn off your device 3. Set your terminal software to log all messages 4. Turn on your device
Observe the bootup process of the device to see if there is any problem with it during powering on
The SF / SG line of switches I believe all use a built in browser application to manage or configure the switch. I do not believe any of the switches in the SF/ SG use RS-232 port. At least my SG200-18 Gigabit does not come with a serial port.
The most likely cause is that you are not following the firmware upgrade path as jbattist pointed out.
here is a link to the SG 300 Firmware update process the last link on the page is the one you want I think.
Sorry the switch is not performing as expected. What is the firmware and boot code that is currently installed? If you are attempting to move up to 1.4.1.03 firmware, The switch would have to be on boot code 1.3.5.06. If it is not, then the switch should not allow you to upgrade the firmware on an unsupported boot code. If the switch is not on this boot code, try upgrading the boot code first using TFTP, then try to upgrade the firmware.. The proper boot code comes in the ZIP file for the latest firmware. Hope this helps.
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