Yes you can cahnge your firmware with other one
but you need to know what model is... for example is SM-G900F...., after this you need to enter on samsung-updates.com and search your device, after this look at wath region you want to have that firmewall..., after this press dowload and choose your link to be downloaded... After you download the firmewall you need to flash in your device with odin3... for falsh I recomand you to look on youtube....
First step search...
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Second is look at the region:
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I recomand to you to use france. germany or europe, UK firmewalls/roms because I used this and are goods...
And the last step press the download button and choose from what mirror you want to download....
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:laugh::laugh::laugh::good::good::good: