The Samsung Galaxy M02 launched in markets such as the Phillippines as a phone set well into the sub ~US$150 bracket with a 5,000mAh battery as perhaps its best feature for its 6.5-inch waterdrop-notched HD+ screen and 3GB of RAM at most.
It never got an M03 update in 2022, which might be explained in part by the underwhelming MediaTek MT6739W SoC that did not even get a series name in 2017. However, it now seems that it has a successor after all, with a potentially significant upgrade in this regard.
Rumors of a Galaxy M04 have been sparked by the reported appearance of the "samsung SM-M045F" on Geekbench. With that model number, it might be construed as a Galaxy A04 re-brand; if so, one or both devices might rock a considerably newer Helio G35 (or MT6765V/WB) platform.
It also seems the M04 could launch with a build of One UI 4 based on Android 12, although it still has 3GB of RAM. Therefore, should this leak prove accurate, a decent update of a budget Android smartphone for certain markets might be on the way.