Accidentally changed uEnv.txt, cannot access to BBB

I unconsciously changed uEnv.txt file and uncommented this line #cape_disable=capemgr.disable_partno=BB-BONELT-HDMI,BB-BONELT-HDMIN,BB-BONE-EMMC-2G.
After the reboot I cannot access to BBB. I just want to change that line from uEnv.txt file without flashing eMMC again(I do not want to lose my files on BBB). Now I connected to BBB after booting from microSD in which standalone image is located. So how can I reach to my old uEnv.txt file and edit it?
Could you please help me?

well... just mount the drive...

mkdir disk
sudo mount /dev/mmcblk1p2 ./disk
nano ./disk/boot/uEnv.txt


Sorry for this repeated question. This issue had been discussed in this link.

Thank you Robert.