SDX57M

The Qualcomm Snapdragon X57 5G Modem is the baseband chipset used in the iPhone SE (3rd generation).

it is also known as  in firmware.

iOS
1.00.04    15.4           (Build 19E241) 15.4.1        (Build 19E258) 1.60.00    15.5 beta      (Build 19F5047e) 15.5 beta 2   (Build 19F5057e) 1.61.01    15.5 beta 3    (Build 19F5062g) 15.5 beta 4   (Build 19F5070b) 15.5 RC       (Build 19F77) 15.5          (Build 19F77) 1.70.00    15.6 beta      (Build 19G5027e) 15.6 beta 2   (Build 19G5037d) 15.6 beta 3   (Build 19G5046d) 1.70.02    15.6 beta 4    (Build 19G5056c) 15.6 beta 5   (Build 19G5063a) 15.6 RC       (Build 19G69) 15.6 RC 2     (Build 19G71) 15.6          (Build 19G71) 15.6.1        (Build 19G82) 15.7 RC       (Build 19H12) 15.7          (Build 19H12) 15.7.1 RC     (Build 19H115) 2.03.00    16.0 beta      (Build 20A5283p) 16.0 beta 2   (Build 20A5303i) 2.05.00    16.0 beta 3    (Build 20A5312g & 20A5312j) 2.07.03    16.0 beta 4    (Build 20A5328h) 2.08.01    16.0 beta 5    (Build 20A5339d) 16.0 beta 6   (Build 20A5349b) 16.0 beta 7   (Build 20A5356a) 16.0 beta 8   (Build 20A5358a) 16.0 RC       (Build 20A362) 16.0          (Build 20A362) 16.0.2        (Build 20A380) 16.0.3        (Build 20A392) 2.20.01    16.1 beta      (Build 20B5045d) 2.21.00    16.1 beta 2    (Build 20B5050f) 2.22.02    16.1 beta 3    (Build 20B5056e) 16.1 beta 4   (Build 20B5064c) 2.22.03    16.1 beta 5    (Build 20B5072b) 16.1 RC       (Build 20B79)