Hi yusuftek,
Out of the 30+ RB750Gr2/3 units that we manage, there was only one that didn't come back online after the v6.43.4 upgrade. We dispatched a technician to that site, who found that the pppoe-client interface had been disabled, likely a result of the failed update. He was still able to access it via LAN though, so he accessed it via winbox, enabled the pppoe-client interface, and the unit came back on with only minor issues. That was our experience - you may need to be prepared with the last backup of that unit in case you need to do a hard reset.
Thanks alot issac.
But the issue am encountering started as result of upgrade i did via system>Packages>Update
Ever since then, i cant seem to access it any longer. The led light is on, it doesn't beep sound.
At the network connection notification, it goes off and on.