With how many devices it's been churning out as of late, it's easy to forget that Realme is still a pretty young brand. And, as it turns out, one that hasn't forgotten about the handsets it launched last year. Case in point: both the Realme 1 and the Realme U1 are now receiving a new software update, that brings them Dark Mode as well as the latest security fixes. Both phones will be on the October 1, 2019 security patch level after you apply the update. They both get the same changelog, except for the fact that the U1 will also add a "partial scene camera effect...
Source: https://www.gsmarena.com/realme_1_and_realme_u1_update_brings_dark_mode_and_latest_security_patches-news-39759.php