/boot/efi failed to mount due to unknown file system "vfat" : CentOS 7.5

I have a centOS 7.5 server that does not boot up. Only boots up to rescue mode. This happened after a forced reboot of the server. I got the following error on CentOS 7.5 after checking the journalctl -p err grub2 was installed after getting the correct x86_64 file into the system, tried to mount the boot/efi, but got the error : Unknown file type "vfat" Then I tried to run dosfsck and correct if there are any dirty bits. There was a dirty bit, and it was corrected. Tried to mount again, and the same error occurred. Unknown file type "vfat". [![enter image description here]] vfat modules are available and they are of the same version as the kernel. I did not update the kernel in this server. so we can rule out the kernel version mismatch problem. Also tried re-installing the kernel and all the packages related to kernel. Still the /dev/sda1 cannot be mounted to /boot/efi. I'm basically ran out of solutions now. Could you help me with this, please. Also I do not have internet to this server. I can download any file from another computer and transfer to this. Please consider this when writing your suggestion. My fstab is as follows,