
Samsung Galaxy Win2
The latest firmware for Samsung Galaxy Win2 (SM-G360BT) is G360BTVJS1BQC1 with Android 5.0.2 (Lollipop), released on March 12, 2017 for 1 region (CSC). Every official firmware build for SM-G360BT, newest first: one row per build with all regions (CSC) that received it.
Each firmware build has its own page at https://samfirm.shop/build/{PDA}, where {PDA} is the build number from the list above. Example: https://samfirm.shop/build/G360BTVJS1BQC1
SM-G360BT started on Android 4 and has received 1 major Android upgrade; it now runs Android 5.0.2 (Lollipop). The newest build, G360BTVJS1BQC1, was released on March 12, 2017. No new build has appeared for 117 months, so regular updates for this model have most likely ended.
Specifications of SM-G360F, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.

SM-G360AZ

SM-G3509

SM-G3589W

SM-G357M

SM-G3568V
The newest firmware for SM-G360BT runs Android 5.0.2 (Lollipop): build G360BTVJS1BQC1, released on March 12, 2017.
The latest build for SM-G360BT, G360BTVJS1BQC1, was released on March 12, 2017 (9 years ago).
SM-G360BT has had no new firmware for 117 months, so regular updates have most likely ended.
Yes, all firmware files for SM-G360BT are 100% official, original, and obtained directly from Samsung servers.
To flash SM-G360BT, you need to download the appropriate firmware, put your device into Download Mode, and use the Odin tool to load the BL, AP, CP, and CSC files.
Downgrading is only possible if the bootloader version (binary bit) of the old firmware matches the current one. Always check the binary version before flashing SM-G360BT.