BBB no EMMC activity at all

Hi guys, so I edited the uENV.txt file on my BBB, and now I can’t mount the EMMC (mmcblk1, it is no longer in /dev) or connect it to my computer via USB. When powering on the BBB, the second user LED remains unlit, indicating that there is no activity on the EMMC. I can still boot from Ubuntu via SD card, but I want to flash Ubuntu to the EMMC, but I can’t! Does anyone have any ideas/suggestions?

Reflash the eMMC. Should be no reason why you can’t hold the boot button to reflash the eMMC by booting from the SD slot…