A few days ago, my samsung started to act funny. I tried to send texts, but my phone just kept saying that it was sending the texts and hours later it would tell me that it failed to send the text. I thought it was weird, but I left it alone. Then, my phone no longer let me download any apps, every time I would try to download an app it would just stay loading without actually making any progress. Finally, I got sick of it so I tried to factory reset my phone. Only now, I can't get past the T-mobile splash screen. I bought this phone off ebay about 10 months ago and when I tried to update it, I was informed that the device was modified even though it was running stock firmware (no sd card at the time). Can someone please tell me how to fix my phone? I don't exactly have the funds to get a new one.