Hello There!
I decided to upgrade my RB450's ROS version v3.10 to v3.30, downloaded it from the Mikrotik's site and FTPed the packages to RB450, then done the reboot on winbox. When it got started NIC LED flashed (eth5, then eth4, eth3,.., eth1/poe), then I hear one 'beep' of slightly longer than usual system starts to load and that's all. No 'twice beep' as per during normal after router booting process, no IP & MAC connectivity on any winbox interface including eth1/poe. Please see the attachment.
I have also gone through the hardware reset process but nothing happened.
Also, gone through the netinstall process with null modem cable serial port connectivity, but nothing happened in the netinstall window and hyperlink terminal window. Please refer to the attachment.
Gone through the web to mugged up & study a lot on each and every topic from the Mikrotik to fix this problem on this, but no luck at all.
Any Mikrotik real expert and/or experienced user out there could fix this to me. I heartily appreciate his great support & assistance in solving this big routerboard's OS bricking/killing issue often related with the Mikrotik products. Thanks