After skipping 1.3.0, which brought the LDAC codec (among other tweaks) to the ES100, I decided to apply the latest update via my Mac mini. Fortunately, Radsone has improved the instructions for entering DFU mode and it worked perfectly.
Once finished with the update, the LDAC codec was automatically selected and I must say, it sounds fantastic paired with my Pixel 2. For those unfamiliar, LDAC supports 24/96 over Bluetooth. Bravo!