Samsung has started firmware development for the Galaxy S10 X, the elusive 5G variant of the company’s upcoming flagship. The 5G variant of the Galaxy S10 has been rumored to be launching sometime in the second quarter of 2019, while a recent report said it could go on sale at the end of March, around three weeks after the non-5G models. But it’s hard to say which of the two it will be based on the fact that Samsung is now working on the device’s firmware.

It’s still an important milestone, though, and puts the 5G model a step closer to an official retail release. As usual, Samsung is working on firmware for all three major South Korean carriers (SK Telecom, LG Uplus, and KT Corporation), and the software version for the build Samsung is testing at the moment is G977NKSU0ASA6. Development for the US-bound Galaxy S10 X hasn’t started yet, and neither can we find any trace of a firmware for other markets, which shouldn’t be surprising as it has been long rumored that the 5G model would be limited to South Korea and the US.

In addition to 5G support, rumors have it that the Galaxy S10 X (the name of the 5G model isn’t yet confirmed) will also have a 6.7-inch screen, a 5,000 mAh battery, and possibly four rear cameras. It’s probably going to be notably more expensive than the non-5G models, and rightly so considering the hardware it’s expected to pack. Samsung is likely to offer more details at the February 20 launch of the Galaxy S10, along with information on the release date and pricing, and you can rest assured that we’ll bring all that information to you live from San Francisco.