I use a Sony Ericsson Xperia Arc phone. Recently, when I put the phone in Tethering Mode, the phone just switched off. Now, whenever I try to switch on the phone, first the SONY logo appears and then XPERIA logo. This repeats itself. I took my phone to a shop & the shopkeeper told me that its OS has to be reinstalled thet costs me RS 1500. As of now, I cant afford this fee. Let me tell you, I never tried reflashing any phone yet. Please anyone help me with the step by step procedures to reflash the phone. Please dont post any link that takes me to any smart phone geek pages like XDA or whatsoever. Just explain it here. Also, I never tried to unlock bootloader and all (what I learnt to be a requirement). I just like to install the Jelly Bean Custom ROM in my phone other than ICS. Please help me. Thanks.