Using the new iPhone OS 3.0

gavinsan · 03-17-2009, 05:27 PM

Hi, i'm a one man iPhone developer, and i mainly use my own iPhone for development. I downloaded the iPhone OS 3.0 beta, but in the iPhone OS 3.0 beta software release - Pre-Installation Advisory there are these two lines:

• Use iPhone OS 3.0 beta software for development only. This new version
should only be deployed on devices dedicated for iPhone OS 3.0 beta software
development.

• Updating devices to iPhone OS 3.0 beta software. By installing iPhone OS 3.0 beta software on your Authorized Test Devices, these Devices are permanently “locked” into testing mode and cannot be restored to earlier versions of iPhone OS.

does this means that if I install this Beta OS, i cannot then restore to the 2.2.1 version? This is my daily phone, and if this OS version is unstable etc. i cannot simply restore? O.o

Encryptic · 03-17-2009, 05:30 PM

Quote:

Originally Posted by gavinsan

Hi, i'm a one man iPhone developer, and i mainly use my own iPhone for development. I downloaded the iPhone OS 3.0 beta, but in the iPhone OS 3.0 beta software release - Pre-Installation Advisory there are these two lines:

• Use iPhone OS 3.0 beta software for development only. This new version
should only be deployed on devices dedicated for iPhone OS 3.0 beta software
development.

• Updating devices to iPhone OS 3.0 beta software. By installing iPhone OS 3.0 beta software on your Authorized Test Devices, these Devices are permanently “locked” into testing mode and cannot be restored to earlier versions of iPhone OS.

does this means that if I install this Beta OS, i cannot then restore to the 2.2.1 version? This is my daily phone, and if this OS version is unstable etc. i cannot simply restore? O.o

Apple had the same "Threats" with iPhone OS 2.0, however, if you know how to use DFU mode you were able to restore things.

If you are worried about this situation, I wouldn't update your iPhone. I would also keep an eye out for more information regarding this topic.

Kryckter · 03-17-2009, 05:30 PM

Quote:

Originally Posted by gavinsan

Hi, i'm a one man iPhone developer, and i mainly use my own iPhone for development. I downloaded the iPhone OS 3.0 beta, but in the iPhone OS 3.0 beta software release - Pre-Installation Advisory there are these two lines:

• Use iPhone OS 3.0 beta software for development only. This new version
should only be deployed on devices dedicated for iPhone OS 3.0 beta software
development.

• Updating devices to iPhone OS 3.0 beta software. By installing iPhone OS 3.0 beta software on your Authorized Test Devices, these Devices are permanently “locked” into testing mode and cannot be restored to earlier versions of iPhone OS.

does this means that if I install this Beta OS, i cannot then restore to the 2.2.1 version? This is my daily phone, and if this OS version is unstable etc. i cannot simply restore? O.o

I was just about to post the same thing. I am wondering this as well. I use my phone as the testing device and do not want to be locked into this...

zenox · 03-17-2009, 05:35 PM

Quote:

Originally Posted by Encryptic

Apple had the same "Threats" with iPhone OS 2.0, however, if you know how to use DFU mode you were able to restore things.

Could you define DFU mode?

Encryptic · 03-17-2009, 05:38 PM

Quote:

Originally Posted by zenox

Could you define DFU mode?

It's a deep restore mode, used by apple for software upgrades. This is used in the processes of jailbreaking actually.

See this page for details on putting your phone in DFU mode. Note: this process changed with iTunes 8.0. DFU Mode | Sleepers.net

gavinsan · 03-17-2009, 05:41 PM

Quote:

Originally Posted by Encryptic

It's a deep restore mode, used by apple for software upgrades. This is used in the processes of jailbreaking actually.

See this page for details on putting your phone in DFU mode. Note: this process changed with iTunes 8.0. DFU Mode | Sleepers.net

Is this a safe process, under the iPhone OS 3.0 beta? I'm really in the process to install it, but if anything goes wrong with the stability of the OS and my most used apps (bought from the app store, and so, compiled for 2.2 / 2.2.1 etc.) it is really a pain, cause as i said, it's mainly my daily use phone.

thanks in advance =)

Encryptic · 03-17-2009, 05:42 PM

Quote:

Originally Posted by gavinsan

Is this a safe process, under the iPhone OS 3.0 beta? I'm really in the process to install it, but if anything goes wrong with the stability of the OS and my most used apps (bought from the app store, and so, compiled for 2.2 / 2.2.1 etc.) it is really a pain, cause as i said, it's mainly my daily use phone.

thanks in advance =)

I can't really speak to the reliability. If you rely really heavily on this device, I would utilize the simulator and an iPod Touch.

Best of luck!

Kryckter · 03-17-2009, 05:46 PM

I am installing OS 3.0 on my main phone as we speak. Ill let ya know how it goes. I did do a backup in iTunes beforehand, just in case.

brentschooley · 03-17-2009, 05:51 PM

Would anyone with multiple devices be willing to try installing iPhone 3.0 and then DFU'ing back to 2.2.1 for those of us who are wondering if it will work?

BostonMerlin · 03-17-2009, 05:58 PM

downloading the os onto my 3g as well which is my primary. I have a 1st gen iphone which i'll use as backup if this messes things up!

John

brentschooley · 03-17-2009, 06:09 PM

I know this worked for 2.0->1.x and in theory it should work for 3.0->2.2.1 but I would love it if someone would try it

Kryckter · 03-17-2009, 06:09 PM

I just installed. Did a restore from iTunes on it. Everything went fine.

The features are awesome!

tkilmer · 03-17-2009, 06:10 PM

Took me a while to figure out how to get to the search screen. Felt really dumb afterwards...

elektrobank · 03-17-2009, 06:13 PM

I'm just guessing here, but it's possible that the update could change the format of some of the data that's stored on your iPhone. So if you updated to 3.0 and started doing your backups, then tried to restore a backup from a 3.0 phone to a 2.x phone, it may contain data in formats that the 2.x OS can't understand, that's what I'd be concerned about. Is there a way to make a backup of your iTunes backup so you can hold on to a clean copy of your data that was last used with OS 2.x?

I'm really eager to update to 3.0 too, but my development phone is also my main cell phone, and I don't want any problems there or the possibility of not being able to go back to 2.x if I need to.

Quote:

Originally Posted by Encryptic

Apple had the same "Threats" with iPhone OS 2.0, however, if you know how to use DFU mode you were able to restore things.

If you are worried about this situation, I wouldn't update your iPhone. I would also keep an eye out for more information regarding this topic.

brentschooley · 03-17-2009, 06:14 PM

Quote:

Originally Posted by Kryckter

I just installed. Did a restore from iTunes on it. Everything went fine.

The features are awesome!

Restore to 2.2.1 or just a data restore of your contacts and such?

brentschooley · 03-17-2009, 06:15 PM

Quote:

Originally Posted by elektrobank

I'm just guessing here, but it's possible that the update could change the format of some of the data that's stored on your iPhone. So if you updated to 3.0 and started doing your backups, then tried to restore a backup from a 3.0 phone to a 2.x phone, it may contain data in formats that the 2.x OS can't understand, that's what I'd be concerned about. Is there a way to make a backup of your iTunes backup so you can hold on to a clean copy of your data that was last used with OS 2.x?

I'm really eager to update to 3.0 too, but my development phone is also my main cell phone, and I don't want any problems there or the possibility of not being able to go back to 2.x if I need to.

Yeah I sorta had this hunch too, but I thought the same thing about 1.x->2.0 as well and that worked.

Kryckter · 03-17-2009, 06:16 PM

Quote:

Originally Posted by brentschooley

Restore to 2.2.1 or just a data restore of your contacts and such?

Restore for contacts and such.

nownot · 03-17-2009, 06:19 PM

talked to peeps on irc, they said no go on the dfu downgrade. im also in the boat of main def device is main phone also, so i dont want to upgrade and it suck so bad and not be able to use my phone. might wait till tomorrow to see if something else comes along that allows downgrade.

brentschooley · 03-17-2009, 06:19 PM

Quote:

Originally Posted by Kryckter

Restore for contacts and such.

Ahh ok, I figured that would work. I'm just wondering about 2.2.1 from a development perspective. Thinking about just getting a Touch for 2.x potentially unless the DFU option seems plausible.

Kryckter · 03-17-2009, 06:22 PM

Quote:

Originally Posted by nownot

talked to peeps on irc, they said no go on the dfu downgrade. im also in the boat of main def device is main phone also, so i dont want to upgrade and it suck so bad and not be able to use my phone. might wait till tomorrow to see if something else comes along that allows downgrade.

Thats scary. Im already on 3.0. Hopefully I dont need to downgrade for any reason.

marleneZ · 03-17-2009, 06:26 PM

Quote:

Originally Posted by Kryckter

Thats scary. Im already on 3.0. Hopefully I dont need to downgrade for any reason.

to install the new os do you just do a restore from the ipsw file? If i double click it it opens iTunes but nothing happens.

thanks in advance

PS and if that's how you do it what happens to your data does it re-populate when you do a sync?

gavinsan · 03-17-2009, 06:27 PM

Quote:

Originally Posted by nownot

talked to peeps on irc, they said no go on the dfu downgrade. im also in the boat of main def device is main phone also, so i dont want to upgrade and it suck so bad and not be able to use my phone. might wait till tomorrow to see if something else comes along that allows downgrade.

wow, so there's no way to downgrade from OS 3.0 beta to 2.2.1?

man, too late, i'm installing it now =S

bu that's a bit scary though, there must be a way, i hope that my local Apple Store wont get an angry costumer (me) because his phone is dead

my main problem is.. and if my most used apps (things, files etc.) just stop to work?...

zenox · 03-17-2009, 06:28 PM

Quote:

Originally Posted by Kryckter

Thats scary. Im already on 3.0. Hopefully I dont need to downgrade for any reason.

Could you try putting your iPhone in DFU mode? I would just like to know if itunes recognizes it as being able to restore?

tkilmer · 03-17-2009, 06:34 PM

Ok, so who else built a simple chat client and is using two phones to talk to each other? Please tell me I am not the only one...

I absolutely love the P2P...It is so easy to use as well...

brentschooley · 03-17-2009, 06:49 PM

Quote:

Originally Posted by tkilmer

Ok, so who else built a simple chat client and is using two phones to talk to each other? Please tell me I am not the only one...

I absolutely love the P2P...It is so easy to use as well...

It was on my list, how easy was it to write that?