Laptop Samsung NP300E5C: Reset BIOS, Disable Secure Boot, UEFI & CSM for Win 7 Install

Hi
In a laptop with Win 8.1 I wanted to install Windows 7. Unfortunately, despite disabling secure boot, the flash drive and the disc still could not boot, even though they were working on another computer. So I changed UEFI in bios to UEFI and CSM. It didn't do anything. After setting up the CSM itself (now I know it was a bug ) the laptop turns on until the bios and samsung logo are loaded and a reset occurs. From the very beginning, the F2 key does not enter the bios, and now, when it is needed, it still does not work . I took out the bios batteries to reset it for over 40 minutes, but to no avail. I am looking for reset jumpers, but I cannot locate them on the board (probably not there). I need help getting him back on his feet.
Once again I took out the battery, now I will wait longer. I hope that some capacitor still holds the bios before the reset, and a longer time without a battery will cause a reset.
Is there any other option to reset the bios or enter its settings?
The motherboard of this laptop is Lampard 14/15 int rev 1.0 and the laptop itself is probably Samsung NP300E5C-A02PL (because all stickers are already illegible).

After disconnecting the power (power supply and battery), hold the switch for half a minute. If it does not help, remove the cmos battery and shorten its contacts.

Thank you for your answer.
I do not fully understand, I am supposed to short-circuit the plus and minus of the battery or socket itself. The board itself does not have any jumpers that I could close.

You are to short the contacts in the socket from which you will remove the battery.

Unfortunately, shorting the contacts did not help, because after starting the bios, there is a reset.

How long you kept compact - it could use at least a dozen or so seconds.

Over 10 sec, but I will try again. I fired it up now with no bios battery, it boots up but no screen or any sounds.
I kept a good 30 seconds of the battery socket shorted with a metal screwdriver, but unfortunately all the time after turning on the computer, only the bios and reset are charged.


I found the jumpers probably, plugged the 1 and 2 pins together, but no effect.

Hi kozak1224,

Three years later, it looks like I made the exact same mistake on my Samsung NP300E5C-AF4FR.

I have a GPT disk with a dual-boot (Lubuntu and Windows 10). Everything was fine until I tried to install Windows 7 from a Legacy USB key (now I know I shouldn't, I should have used a UEFI key...). I changed from UEFI to CSM . Now my computer keeps rebooting for ever. It says "[F2] for Setup [F4] for Recovery", and then immediately reboots. Again and again. The function keys have no effect (I tried them all, from F1 to F12). I also tried ESC and DEL, with no success. I am unable to boot on any of the two systems. I am unable to enter the BIOS and restore to UEFI. I also removed the hard disk, but my computer keeps rebooting, even without a hard disk.

Did you have any success repairing your system? How did you solve your problem?

[Edit] Solved. I removed the main battery and the CMOS battery, and shorted the connectors for 10-15 seconds to ensure that eventual capacitors were discharged. The BIOS was automatically reset to UEFI, and I was able to boot Lubuntu again. Hope this helps.

@remiss
Hi remiss,

I have exactly the same problem (following the same process with a dualboot). Can you please let me know how can I short the connectors ? I would like to try if this solution work for me.

Many thanks

Hi aliamad,
You can use any small metallic item. Personally I used a simple paperclip - un trombone, in French - that I bent so that it can touch both contacts on the motherboard. A small 5-cents coin might do the job too, if you manage to insert it in the place where the battery should be.

Many thanks remiss!

It seems that it is not working with my issue, but thank you for your answer. I will try again, maybe I am doing it wrong.

Thanks again

If you have access to a second laptop, remove the drive from yours and insert it into the other one. Install the system to the first boot, then swap disks again. Complete the installation on your laptop.

Thank you kindlar, I will try this solution !

Cheers,