
Samsung Galaxy Jump2
Every official firmware build for SM-M336K, 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/M336KKSSEGZE1
Specifications of SM-M336B, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.

SM-M085F

SM-M476B

SM-M076B

SM-M176B

SM-M075F

SM-M366B

SM-M566B

SM-M166P
You can find the firmware on the model: SM-M336K page.
Yes, all firmware files for SM-M336K are 100% official, original, and obtained directly from Samsung servers.
To flash SM-M336K, 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-M336K.