I am pretty new to this whole rooting process and stuff like that, but I rooted my phone and put the TWRP Rom on my phone. It has been running really slow lately, so I did a hard Advanced Wipe from the TWRP menu. I checked all the options in the Advanced Wipe area. Now when I try to reboot it, it keeps saying that there is No OS installed. And when I reboot it, it just feezes at the Samsung Galaxy screen. How do I install an OS on it? Thanks in advance...
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