[Q] Unable to downgrade to .534 after mainboard change!

dape16 · May 25, 2014

I have rooted my Z1 many times without problem, first downgraded to .534, root with Bin4ry's root tool, then flash the .zip file from recovery and flash stripped .ftf with FlashTool.
By rooting this way I can keep my bootloader locked.

A couple of weeks ago I had to send my phone for repairs when the call speaker gave up and they changed the mainboard (new IMEI).

After this I can not downgrade to .534 anymore! It will stuck at a bootloop, with only the Sony logo showing. Downgrading to .257 (the version after .534) is no problem though.
I have tried many different .534 tft-files, including NUT's.

Any ideas? Could this new mainboard be incompatible with the oldest firmwares? Sounds unlikely to me.

Thanks!

dlads · May 26, 2014

dape16 said:
I have rooted my Z1 many times without problem, first downgraded to .534, root with Bin4ry's root tool, then flash the .zip file from recovery and flash stripped .ftf with FlashTool.
By rooting this way I can keep my bootloader locked.

A couple of weeks ago I had to send my phone for repairs when the call speaker gave up and they changed the mainboard (new IMEI).

After this I can not downgrade to .534 anymore! It will stuck at a bootloop, with only the Sony logo showing. Downgrading to .257 (the version after .534) is no problem though.
I have tried many different .534 tft-files, including NUT's.

Any ideas? Could this new mainboard be incompatible with the oldest firmwares? Sounds unlikely to me.

Thanks!

If it's incompatible with 534 then i'd be surprised, my guess is that it's a dodgy download and you should re-download the FTF file or an alternative and make sure it's the only thing that your computer is doing at the time, even check the MD5 checksum if it's available.

Are you flashing the full FTF file when downgrading and allowing for a wipe?

Only problem i've had when downgrading is losing the IMEI but after you've rooted , installed a custom recovery and installed a custom rom that'll come back anyway.

dape16 · May 26, 2014

dladz said:
If it's incompatible with 534 then i'd be surprised, my guess is that it's a dodgy download and you should re-download the FTF file or an alternative and make sure it's the only thing that your computer is doing at the time, even check the MD5 checksum if it's available.

Are you flashing the full FTF file when downgrading and allowing for a wipe?

Only problem i've had when downgrading is losing the IMEI but after you've rooted , installed a custom recovery and installed a custom rom that'll come back anyway.

Thanks, yes I have tried with 5 different .534 ftf-files, all of them resulting in this bootloop. I am doing a full flash with wipe. Downgrading to .257 is working fine though, but then I cant root.

I am running out of ideas

dlads · May 26, 2014

dape16 said:
Thanks, yes I have tried with 5 different .534 ftf-files, all of them resulting in this bootloop. I am doing a full flash with wipe. Downgrading to .257 is working fine though, but then I cant root.

I am running out of ideas

Are you branded? What model is the phone C6903? C6902?

don't forget the obvious stones

dape16 · May 26, 2014

dladz said:
Are you branded? What model is the phone C6903? C6902?

don't forget the obvious stones

It's not branded. No SIM-lock, Generic_NCB customization. C6903.

Now I have tried with older versions of FlashTool and I tried other USB-ports too, but no success. Newer firmwares then .534 flashes just fine.

dlads · May 26, 2014

dape16 said:
It's not branded. No SIM-lock, Generic_NCB customization. C6903.

Now I have tried with older versions of FlashTool and I tried other USB-ports too, but no success. Newer firmwares then .534 flashes just fine.

Which version of flashtool are you using currently? I've found that some firmwares just don't like the older flashtools.

What about different USB cables? Shouldn't make any difference but I thought I'd ask. I find it odd the way it'll work for newer but not older firmwares, perhaps someone else should chime in with an idea.

I'm all out, as this isn't something i've come across and everything i'd try myself i've told you.

dape16 · May 26, 2014

dladz said:
Which version of flashtool are you using currently? I've found that some firmwares just don't like the older flashtools.

What about different USB cables? Shouldn't make any difference but I thought I'd ask. I find it odd the way it'll work for newer but not older firmwares, perhaps someone else should chime in with an idea.

I'm all out, as this isn't something i've come across and everything i'd try myself i've told you.

Thanks for your help.

Now I have tried with another computer and another USB-cable, and also tried to flash the older .526 and .518 firmwares. Tried FlashTool 0.9.1.6 and .5 and .4.

Same result.

Seems very strange that this new mainboard should not be compatible with these firmwares?

dlads · May 27, 2014

dape16 said:
Thanks for your help.

Now I have tried with another computer and another USB-cable, and also tried to flash the older .526 and .518 firmwares. Tried FlashTool 0.9.1.6 and .5 and .4.

Same result.

Seems very strange that this new mainboard should not be compatible with these firmwares?

It does seem strange and i'm pretty much out of ideas myself for you m8. Mad one that.

dape16 · May 27, 2014

dladz said:
It does seem strange and i'm pretty much out of ideas myself for you m8. Mad one that.

Thanks anyway, I hope somebody else has an idea

dlads · May 27, 2014

dape16 said:
Thanks anyway, I hope somebody else has an idea

click thanks dude,

Hope you work it out

Just had a thought, can't you now root later firmwares?

dape16 · May 27, 2014

dladz said:
click thanks dude,

Hope you work it out

Just had a thought, can't you now root later firmwares?

I dont think it is possible to root any firmware later then .534? Not without unlocking bootloader?

gregbradley · May 27, 2014

dape16 said:
I dont think it is possible to root any firmware later then .534? Not without unlocking bootloader?

yes it is, any 4.2 FW can be rooted

Its just that 534 can be done using [NUT]s installation of dual recovery

dape16 · May 27, 2014

gregbradley said:
yes it is, any 4.2 FW can be rooted

Its just that 534 can be done using [NUT]s installation of dual recovery

Thanks, but I have tried both vroot and Bin4ry's root tool on .257. Didn't work. Is there any other method for rooting?

Edit: Sorry, didn't see the link in your signature, will try that.

gregbradley · May 27, 2014

dape16 said:
Thanks, but I have tried both vroot and Bin4ry's root tool on .257. Didn't work. Is there any other method for rooting?

Edit: Sorry, didn't see the link in your signature, will try that.

DO NOT USE VROOT!!!!

It send your IMEI number to an IP address in china..

I cant believe people still do not know this

dape16 · May 27, 2014

gregbradley said:
DO NOT USE VROOT!!!!

It send your IMEI number to an IP address in china..

I cant believe people still do not know this

Well, I tried vroot because it is in the first posts in the "Ultimate Xperia Z1 Guide" sticky thread.

Since I have always used Bin4ry's tool, I guess I have not noticed any thread about vroot being dangerous.

dape16 · May 27, 2014

gregbradley said:
yes it is, any 4.2 FW can be rooted

Its just that 534 can be done using [NUT]s installation of dual recovery

Right now I have .257 firmware flashed which is a 4.2.2.

I have tried to root with Bin4ry, vroot, Kingo, and [NUT]s recovery, but it is not possible.

Everywhere I look people say that it is a must to downgrade to .534 when rooting with a locked bootloader.

What have I missed?

Thanks,

gregbradley · May 27, 2014

257 was the first one that closed that exploit, you have to go back further.

I know you say 534 does not flash for you, but what error does flashtool give?

dape16 · May 27, 2014

gregbradley said:
257 was the first one that closed that exploit, you have to go back further.

I know you say 534 does not flash for you, but what error does flashtool give?

Thank you, I misunderstood an thought .257 was rootable too.

No error in Flashtool, flashes fine but is stuck on bootloop with Sony logo.

Tried .518, .526 and .534

gregbradley · May 27, 2014

make sure you do not exclude any part of the FTF and wipe everything,

Can you get a log from the phone?

Make sure you backup and clean your sdcard (So there is no trace of recovery files on there)

dape16 · May 27, 2014

gregbradley said:
make sure you do not exclude any part of the FTF and wipe everything,

Can you get a log from the phone?

Make sure you backup and clean your sdcard (So there is no trace of recovery files on there)

I have cleaned the internal sdcard and tried without external sdcard and simcard.

Don't think it is possible to get a log file from the phone while in bootloop?

If my new mainboard is incompatible with .534 and older, I guess other users would have the same problem?

[Q] Unable to downgrade to .534 after mainboard change!

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