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[Q] [Answered] Questions before atempting to install CM

OP Nijin

15th January 2014, 02:32 PM   |  #1  
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Hello xda-developers,

My TF300T was becoming very slow in the last few months so I decided to reset it to do a "fresh start". While doing so I would also like to upgrade my ROM. (Im currently running Android 4.1 with CleanRom 3.2).

I'm using the CWM Recovery 6.0.1.3 and would like to upgrade to CyanogenMod 10.2 (Stable - the *.zip file from the CM-website)

By reading several threads there seems to be some problems with current Android Versions and older bootloaders. My question is now:

Can I simply flash the new CM-zip with my recovery (After doing the factory reset) - or is there anything else I have to watch out for?

Thanks for your help in advance!
Last edited by Nijin; 20th January 2014 at 06:34 PM. Reason: [Answered] Tag added
15th January 2014, 11:35 PM   |  #2  
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Quote:
Originally Posted by Nijin

Hello xda-developers,

My TF300T was becoming very slow in the last few months so I decided to reset it to do a "fresh start". While doing so I would also like to upgrade my ROM. (Im currently running Android 4.1 with CleanRom 3.2).

I'm using the CWM Recovery 6.0.1.3 and would like to upgrade to CyanogenMod 10.2 (Stable - the *.zip file from the CM-website)

By reading several threads there seems to be some problems with current Android Versions and older bootloaders. My question is now:

Can I simply flash the new CM-zip with my recovery (After doing the factory reset) - or is there anything else I have to watch out for?

Thanks for your help in advance!

If you are on a 4.1 ROM you probably need to upgrade your bootloader first.
The easiest way is to flash the latest ASUS stock ROM, then do a factory reset and after that flash recovery and your new ROM.

There are several ways to accomplish this, all covered in detail in several threads.

Sent from my TF300T using Tapatalk
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16th January 2014, 06:57 PM   |  #3  
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Quote:
Originally Posted by Nijin

Hello xda-developers,

My TF300T was becoming very slow in the last few months so I decided to reset it to do a "fresh start". While doing so I would also like to upgrade my ROM. (Im currently running Android 4.1 with CleanRom 3.2).

I'm using the CWM Recovery 6.0.1.3 and would like to upgrade to CyanogenMod 10.2 (Stable - the *.zip file from the CM-website)

By reading several threads there seems to be some problems with current Android Versions and older bootloaders. My question is now:

Can I simply flash the new CM-zip with my recovery (After doing the factory reset) - or is there anything else I have to watch out for?

Thanks for your help in advance!

Quote:
Originally Posted by f69m

If you are on a 4.1 ROM you probably need to upgrade your bootloader first.
The easiest way is to flash the latest ASUS stock ROM, then do a factory reset and after that flash recovery and your new ROM.

There are several ways to accomplish this, all covered in detail in several threads.

Sent from my TF300T using Tapatalk

When you upgrade your bootloader, you will need to upgrade your recovery as well to a -42 TWRP if you are flashing CM10.2 or TWRP 2.6.3.1 for KitKat.
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17th January 2014, 05:58 PM   |  #4  
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Quote:
Originally Posted by f69m

If you are on a 4.1 ROM you probably need to upgrade your bootloader first.
The easiest way is to flash the latest ASUS stock ROM, then do a factory reset and after that flash recovery and your new ROM.

There are several ways to accomplish this, all covered in detail in several threads.

Sent from my TF300T using Tapatalk

Quote:
Originally Posted by cmendonc2

When you upgrade your bootloader, you will need to upgrade your recovery as well to a -42 TWRP if you are flashing CM10.2 or TWRP 2.6.3.1 for KitKat.

Alright, get Asus Stock from their website, install that, then reset and flash recovery (TWRP - what exactly does the "-42" mean?) After that I'm good to install CM.

Okay, I think I understood - thanks!
17th January 2014, 06:11 PM   |  #5  
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Quote:
Originally Posted by Nijin

Alright, get Asus Stock from their website, install that, then reset and flash recovery (TWRP - what exactly does the "-42" mean?) After that I'm good to install CM.

Oops, got the order wrong: first flash recovery, then do the factory reset using recovery. Don't use the wipe option on the bootloader screen.

There are several versions of TWRP, usually named -ics, -jb and -42.
Don't use the -ics or -jb versions with the new bootloader, but use a -42 version for flashing CM 10.
For flashing CM 11 you need yet another variant of TWRP that is not available from the official download site. Check the CM 11 thread for a download link.

Be careful, using the wrong recovery can result in an expensive brick.

Sent from my TF300T using Tapatalk
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17th January 2014, 07:25 PM   |  #6  
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Quote:
Originally Posted by f69m

Oops, got the order wrong: first flash recovery, then do the factory reset using recovery. Don't use the wipe option on the bootloader screen.

There are several versions of TWRP, usually named -ics, -jb and -42.
Don't use the -ics or -jb versions with the new bootloader, but use a -42 version for flashing CM 10.
For flashing CM 11 you need yet another variant of TWRP that is not available from the official download site. Check the CM 11 thread for a download link.

Be careful, using the wrong recovery can result in an expensive brick.

Sent from my TF300T using Tapatalk

Ah okay - but this leaves another question: Why exactly do I need the Asus ROM when I already have a 4.2 recovery? Shouldn't Cyanogenmod 10.2 take care of the bootloader then?

Thanks for your help!
17th January 2014, 08:03 PM   |  #7  
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Quote:
Originally Posted by Nijin

Ah okay - but this leaves another question: Why exactly do I need the Asus ROM when I already have a 4.2 recovery? Shouldn't Cyanogenmod 10.2 take care of the bootloader then?

No, CM does not include a bootloader. That is only included in the stock ROM.
That bootloader runs early before the CM Linux kernel is loaded.

The "4.2" recovery only means that it works with the updated bootloader ASUS introduced with the Android 4.2 update. Sorry, I know it is confusing. Thank ASUS for giving us all those incompatible bootloader versions.

Sent from my TF300T using Tapatalk
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20th January 2014, 05:57 PM   |  #8  
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Quote:
Originally Posted by f69m

No, CM does not include a bootloader. That is only included in the stock ROM.
That bootloader runs early before the CM Linux kernel is loaded.

The "4.2" recovery only means that it works with the updated bootloader ASUS introduced with the Android 4.2 update. Sorry, I know it is confusing. Thank ASUS for giving us all those incompatible bootloader versions.

Sent from my TF300T using Tapatalk

Okay, this makes sense (kind of). I think I know everything now - I'l try to update when I get a little free time. Thanks for your help!

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