CentOS - Jun 2020 - How to rebuild the kernel

Hi everyone,
I am using Centos 7.8.2003 kernel 3.10
. I was trying to build and install the latest linux stable kernel i.e.
5.7, I successfully did the process but accidentally messed it up by
copying the .config file again in 5.7 kernel src,I tried to rebuild the 5.7
kernel but got make error as I was still on 5.7 kernel.

Then I changed to 3.10 and tried to rebuild 5.7 but was not successful.
I tried to reboot the system but this time I was in the maintenance mode.

So if anyone could suggest any help in recovering the 3.10 kernel.

On Wed, 3 Jun 2020 20:24:35 +0530
Harsh chopra <serviceprovider.tester at gmail.com> wrote:
> Hi everyone,
> I am using Centos 7.8.2003 kernel 3.10
> . I was trying to build and install the latest linux stable kernel
> i.e. 5.7, I successfully did the process but accidentally messed it
> up by copying the .config file again in 5.7 kernel src,I tried to
> rebuild the 5.7 kernel but got make error as I was still on 5.7
> kernel.
You may want to have a look at elrepo and the kernel-ml package. Doing
this yourself can be painful.

/Peter