What's the proper way to update a jailbroken iphone?

So I have a 3GS which you must know, pretty old, especially because it is still on iOS 5.1.1 jailbroken.
And yesterday I tried updating it into iOS 6.6.1 via iTunes after backing it up on iTunes as well, but it is said that it couldn't be updated so I have to restore my iPhone first. But when I restored it, blue screen suddenly appeared and somehow I got the BIOS warning that said cache memory error. I succeeded in rescuing the files by backing it up and moved it into a new internal hard disk drive but now I'm afraid of updating my phone again and breaking my computer all over again. Seeing this condition, what do you think I should do?

I heard that I was supposed to reset all settings and turn off all the jailbroken tweaks but I didn't do that.

My iphone 4 has been acting up all day?

Okay, so, I have a iphone 4, got i about a year or so ago. I hadn't had any problems with it until the ios7 update came out. I didn't do the update, i personally thought the style was kinda unpleasing and i heard a lot people said it took up a lot of storage. Well, a few months ago my phone stopped letting me facetime. It will say connecting then it will say disconnecting before anything happens. I've tried logging in and out of FT and i've checked Wi-Fi, well I was like whatever dude i'll use skype. So, that's what I did until my laptop just messed up and is in the shop. So, now it's just me and the phone. Well, today suddenly all of my stuff started being all crazy. It started with the app Kik. My kiks would just disappear as i sent them and i couldn't receive any or read any sent to me. I was like okay. So, i turned my phone on and off a few times. It would work for a second then go back to how it was. Well, then my interenet wouldn't load or anything and i even used 3G and it still didn't work? Plus my family was on there stuff so, the Wi-Fi was on. Then my texts aren't even sending. I read if you download a app then delete it, it would make the other apps so, I tried and it kept saying i already had the app(s)? I thought it could a storage problem and i went to go delete pics and once i clicked the delete button it would just close the app and not delete anything. At this point I don't care if I update, I don't have storage though. I'm gonna call later today.

How to Silent Iphone5's camera sound?

I know there's a silent/ring button on the left side. I already click it to the silent mode but the camera sound is still on everytime i took a picture. How can I turn it off? I bought this phone a couple of days ago and I used to use an iphone 4 and it usually work if i turned the silent mode on. But it didn't work for this iphone. Any one know what's wrong?

Visa/Mastercard terminal paymnent options?

Ok.

I'm looking at an eftpos merchant facility called Fast Pay.

It is a smart phone app on your iphone. It accepts credit/debit cards only & it doesn't ask for a pin or signature & you don't have to swipe or scan your card.

It is much like doing credit cart payments over the phone instead you are doing it in person

My question is.

If you walked into a market stall and you wanted to buy something with your bank card & the only option was fast pay or similar where there's no pin or signature:

Would you?
A) rather pay with a eftpos terminal that asks for a pin
B) Hand your credit/debit card over the counter where they enter your details with no pin or signature. But you can receive an emailed receipt to your email of your payment.

Your opinions would be appreciated

Or if you have any other opinions just feel free to say so

Will iPhone save phone calls and missed calls?

So I lost my iPhone and was wondering if when i get my replacement iPhone. Will it save like the numbers i called, or like my missed calls. Because i got a lot girls numbers at this concert i went too, but ended up losing my phone at the concert. I didn't save their numbers, i just called it, but didn't really save the numbers thinking i was going to save the numbers later the night, which i couldn't because i ended up losing my phone. I really hope that it can save the numbers i called once i get my new iPhone.

Would this be a good dummy/toy?

So lately my brother has been using my phone and iPod. I thought that getting him a fake plastic one would keep him from taking my phone. WRONG! He complained, saying it was plastic, but was fine with it not working. So, I figured getting some cheap parts for assembling a dummy iphone 4 (home button, screen, back, and a weight in it to add for real ness) so I've been saving money and got enough for it. Is this a smart idea? Or am I wasting my time? (He's 12 years old with autism.)

How to tell if someone blocked my number?

Okay so I texted someone today(I have an iPhone w/ iOS 7 on virgin mobile and he has an android) and I got a text from 923-0 that says "The customer you are trying to text is out of service. Msg 2132" I'm pretty paranoid and thinking he's ignoring me.did he block my number or is his phone really out of service sorry if I sound really idiotic for asking this haha