Database Users

Problem with Partition Table

Hi guys,
I'm experiencing a very big problem with a friend of mine's nexus 4. I've done the same thing in the same order with my phone (nexus 4 too) five minutes before and it worked.
We installed 4.4 stock rom downloaded from official google website via fastboot and all went well on my device. The problem was that we repeated the same identical procedure on my friend's nexus 4 and it went well except for the fact that the phone only had 5gbs available after the flash, so we red on the internet that we had to repeat the procedure using "fastboot -w update" instead of flashing every single file contained in the zip folder.
So it's now that borns the real problem. We've erased all partitions (fastboot erase cache, userdata, system, bla bla) and reflashed all. But from this point it stucks on android 4.4 loading logo.
We've tryied to repeat the operation and we've noticed that "fastboot erase bootloader" command answers with "Failed (remote: bootloader partition does not exist)". So we tryied to install cwm recovery and flash from sideload, it works and loads cyanogenmod logo but stucks on it again, tryied to flash everything possible and it works but after don't start.
The strange thing is that the bootloader appears to not exist but if i do the command: fastboot flash bootloader C:\...\bootloader.img it works and says "writing... OK" so i really don't know what could be the problem.
Please guys help us, my friend is on the point to sell his phone but we both are SURE that if it still can enter on recovery and on bootloader it could be restored!!! But we don't know why! Tryied every possible solution on the web, and nothing worked for now...
Thanks to all in advance!

Install the latest twrp recovery, enter it and go to the wipe menu, chose the format data option. Then give a rom a try.

meangreenie said:
Install the latest twrp recovery, enter it and go to the wipe menu, chose the format data option. Then give a rom a try.
Click to expand...
Click to collapse
Hi, thanks for the answer. Fortunately i've just resolved the problem. It worked after I wiped data from the STOCK recovery (it was the first thing i've done with the cwm several times but unsuccessfully). Now it works perfectly. Thanks again :victory:

fdm91xda said:
Hi, thanks for the answer. Fortunately i've just resolved the problem. It worked after I wiped data from the STOCK recovery (it was the first thing i've done with the cwm several times but unsuccessfully). Now it works perfectly. Thanks again :victory:
Click to expand...
Click to collapse
For future references. Most likely the reason why your phone didn't boot up is because you 'erase' a partition and left it unformatted. The 'erase' command wipe out the partition so no data is there and it can't access it. If you erase userdata, then there would be no accessible internal storage and the phone cannot boot.
Which is why after you erase it, you need to either flash something over it or format the partition to make it blank: fastboot format userdata (this is what Format DATA option in TWRP is).

[HELP] Bricked Umi Zero

Hello. Sorry for my english. I want flash my phone via rootjoy to Arcatarc's MIUmIZERO and i only can see miui logo. next i want back to stock rom from needrom via sp flash tool, i followed instructions and i stop, when red status back not change for 20 minutes. and i can't charge my phone, can't conected to pc, can't turn on, looks like dead. How unbrick my phone? please help
problem solved

how did you solve it? please let me know as i am in the same boat

If it's stuck on the MIUI screen then it's possible the bootloader wasn't flashed properly.
If you can reboot the phone in fastboot you can flash the bootloader via PC.

it is dead . the phone wont turn on . the pc wont recognise it anymore , it was fine ... untill i tried to flash stock through sp flash tool .
i was running antarcts emui,.... tried flashing using the method on umi digi forum : http://umidigi.com/forums/topic/how-to-restore-rom-version-3-03-2/ ... preloader was unticked, and when i tried firmware uopgrade option...nothing happened, and the phone was dead after that.

thepopos said:
If it's stuck on the MIUI screen then it's possible the bootloader wasn't flashed properly.
If you can reboot the phone in fastboot you can flash the bootloader via PC.
Click to expand...
Click to collapse
I managed to make it boot.
The problem is I have twrp and some chinese recovery . And I cant go back to stock.
Fastboot cant flash recovery for some reason ... so I can go back to rootjoy.

use adb side load an try to flash a working rom, the original one from umi website or emui.

can you get in recovery mode? volume (+ or - try both) and power button for some seconds
if yes go adb side load, (check google) and transfer an original rom, then flash it again in the recovery

My Umi Zero is bricked, because I cannot mount /system. I can get into the TWRP, but I cannot do anything, even restore my backup because of this. Does anyone have idea what to do?

Pospa420 said:
My Umi Zero is bricked, because I cannot mount /system. I can get into the TWRP, but I cannot do anything, even restore my backup because of this. Does anyone have idea what to do?
Click to expand...
Click to collapse
If the system is unstable with popups etc or with damaged partitions you can get past that with TWRP.
Boot into recovery Wipe/Advanced Wipe. Then after that is completed, without rebooting, Format Data. That should sort out your partitions.
Then Install ROM from the recovery. It will need to be on the device. If your new ROM is not already there plug in a USB lead and transfer the zip file from your pc.
If you want to re-install your backup, do that instead.
If that doesn't work Backup in TWRP, even though there is no system. Then copy your Nandroid backup (must have been made via TWRP) and paste into the same folder as the Backup you just made, overwriting if asked.
I have had to do all this myself!
Good luck

Hi all!
I have the simular problem.
Umi Zero can not start.
But recovery seems to be working.
1) TWRP recovery 2.8.2
After full wipe, my TWRP recovery write "Unable to mount /SYSTEM"
The same message I have if I try to flash original 3.10 ROM via TWRP.
It is impossible to mount or format or repair SYSTEM via recovery
But it is possible to see files in FileManager and go to Fastboot and ADB mode
2) ADB and Fastboot mode.
Impossible to flash any partition.
"boot" - checksum error
"recovery" - "not support flash" message
"system" - filesystem created, start "erasing" and freeze. If I disconnect phone, have got message "failed (too many links)"
adb sideload does not work also
3) SP Flash Tool
I tried with full 3.10 ROM and with CRT 3.0 recovery
Download mode and Format+Download mode.
The same result: yellow bar finished and got message "Checksum error" or something like that.
All this experiments change nothing in phone. I still have TWRP recovery and "unable to mount /SYSTEM" message.
Any advices?
I am not English-speaking guy, as you guess), sorry.

It looks like memory become write-protected...

YrP said:
Hi all!
I have the simular problem.
Umi Zero can not start.
But recovery seems to be working.
1) TWRP recovery 2.8.2
After full wipe, my TWRP recovery write "Unable to mount /SYSTEM"
The same message I have if I try to flash original 3.10 ROM via TWRP.
It is impossible to mount or format or repair SYSTEM via recovery
But it is possible to see files in FileManager and go to Fastboot and ADB mode
2) ADB and Fastboot mode.
Impossible to flash any partition.
"boot" - checksum error
"recovery" - "not support flash" message
"system" - filesystem created, start "erasing" and freeze. If I disconnect phone, have got message "failed (too many links)"
adb sideload does not work also
3) SP Flash Tool
I tried with full 3.10 ROM and with CRT 3.0 recovery
Download mode and Format+Download mode.
The same result: yellow bar finished and got message "Checksum error" or something like that.
All this experiments change nothing in phone. I still have TWRP recovery and "unable to mount /SYSTEM" message.
Any advices?
I am not English-speaking guy, as you guess), sorry.
Click to expand...
Click to collapse
Hi
Did you Advance Wipe and Format Data?
I found that worked.
Alternatively, you could use Rootjoy to put just about any ROM on. CM 12.1 works ok.
Once you have a stable installation, install a custom recovery like TWRP 2.8.7 from Needrom. I used Mobileuncle, an app from the Playstore. However, I looked just now and it doesn't seem to be available.
I have tried Rashr, but couldn't get it to work.
Once you have it all stable you can flash the ROM you really want via TWRP.
Good luck

Advance Wipe and Format Data or flashing new stable ROM via TWRP did not work for me. The same result- unable to mount /system.
Rootjoy and Mobileuncle could be used if phone is working. My phone works in recovery mode only.
I tried to flash different recoveries but did not find the way to do this. As I wrote, Sp Flash Tool, Fastboot and Adb Sideload did not make any changes to my recovery. I think, flash new recovery will help if I found the way)
Or if I discover the method to test and\or repair /system partition from PC
But thank you for answer)

@YrP
Rootjoy works from your pc

Yes, Rootjoy- works)
But for establish connection phone must work too.
And not in recovery mode.

@YrP
I have already done all this with my daughter's Zero.
However, it's in bits at the moment while we wait for a part from China. So I can't go through the process with you live, step by step.
I am in the UK.
If you send the phone to me I will try and fix it for you.
PM me if you want to go ahead and I will let you have my address.

I am in Ukraine, it is too far from UK)
I will keep trying to find the way to fix it by myself.
But thank you very much for your attention and advices.

@YrP
I have got my daughter's phone back together and fixed (mostly).
Did you manage to get your Zero going?
Sent from my Nexus 4 using XDA-Developers mobile app

@goldbear
My UMI is still bricked(
It is flash memory problem, I think.
I am trying to find the tool to remap internal memory, to move SYSTEM part to other physical place. But did not find it yet.
What was your way?

Zero stutters, processes crash or the phone will not boot into System
Have you already tried a Factory Reset or re-installed the ROM?
What can you do?
You could try the following. However, if your phone blows up, orders a takeaway or elopes with your girl-friend, please don’t blame me.
1. Provided you already have TWRP custom recovery installed and your phone is powered down boot into Recovery: hold the volume down and power buttons until the Zero logo appears then let go
2. Select Wipe/Advanced and select Dalvik Cache, System, Cache and Data. Slide to execute
3. Select Format Data/ type yes and slide to execute
4. Reboot into Recovery without installing a new ROM
5. Select Backup, choose SD card rather than internal storage and give the file a memorable title like Blank Backup and date. Select Boot, Logo, Recovery and Uboot. Slide to execute
6. The next step requires you to have a Nandroid backup made via TWRP already made of a stable ROM. If it isn’t stable or you don’t have one I have attached a clean backup below. It’s derived from Cyanogen Mod 12.1. This is based on Lollipop 5.1, with Gapps and rooted. I have found this to work. As the title of the file suggests, it’s a factory reset, ie no personal data included. Download it to your pc unzip and save it.
7. Connect your phone to your pc via USB cable and open Windows Explorer
8. Find your stable backup or the one below and drill down until you see the folder with 15 files, starting with data.info and ending with uboot.emmc.win. Select all and Copy.
9. Open another window and find the TWRP folder on the SC card of your phone. Drill down to the same folder containing similar files as to step 8 above. Click in folder and Paste. When prompted select Copy and Replace, all and Ok
10. If your pc doesn’t show your phone and the SD card, in recovery select Mount and USB storage.
11. In Recovery select Restore and the Blank Backup (or whatever file name you gave it, now populated with usable ‘data’). Slide to execute
12. Give it time to load and boot up
13. You should be good to go!
If you don’t like CM 12.1 installing a new Launcher from the Playstore, like Cheetah will make it run smoother. Everything after that is down to you.
Of course, you could flash another ROM via TWRP
The backup below was made via TWRP 2.8.6. This is also attached below. You can install this via a previous version of TWRP as an image. Unzip it first.
Assuming this doesn’t wreck your phone and you like the guide please click Thanks below.
https://drive.google.com/file/d/0ByoLjFrSKxLwc01UUWZBZEQtbWs/view?usp=sharing
https://drive.google.com/file/d/0ByoLjFrSKxLweGhqNGJuVGV1a0U/view?usp=sharing

Help with bricked xiaomi redmi 2 prime

Hey guys,
I have a problem with a bricked xiaomi redmi 2 prime.
After a bootloop i tried to fix the problem with a system reset. But this does not work
After i booted into recovery and wiped all data, the phone reboot but than nothing happend. So i tried to flash the rom with the mi flash tool, but there i get the error "remote: failed to write partition".
So i went over to the adb and fastboot programms, with fastboot i erased system, userdata, recovery, boot and then i flashed the images of this elements back on the phone (fastboot flash sayed that flashing went successfully)
Then the phone reboot, nothing happend and i can´t get into recovery mode, also adb doesn´t recognoze the phone anymore
Have you any idea what i can do to fix the phone, or can i put it into the trash?
Thanks for your help

Stop experimenting.
Does fastboot work? Do a full flash with miflash(erasing all storage)(firmware should be of your model itself)
If fastboot doesnt work,try putting in the charger with battery in,if there is any vibration,you have a chance of reviving your r2
#fingerscrossed

Ezio95 said:
Hey guys,
I have a problem with a bricked xiaomi redmi 2 prime.
After a bootloop i tried to fix the problem with a system reset. But this does not work
After i booted into recovery and wiped all data, the phone reboot but than nothing happend. So i tried to flash the rom with the mi flash tool, but there i get the error "remote: failed to write partition".
So i went over to the adb and fastboot programms, with fastboot i erased system, userdata, recovery, boot and then i flashed the images of this elements back on the phone (fastboot flash sayed that flashing went successfully)
Then the phone reboot, nothing happend and i can´t get into recovery mode, also adb doesn´t recognoze the phone anymore
Have you any idea what i can do to fix the phone, or can i put it into the trash?
Thanks for your help
Click to expand...
Click to collapse
Yup actually download the latest version of miui fastboot files..paste them in the fastboot folder... Dont bother erasing you phn again(as it does erase at the time of writing new files...)And most importantly flashing only 3 files is more than enough. Flash them in the order boot.img, system.img, recovery.img and thats it. If your problem is actually not booting into fastboot then....press the volume down button and insert your usb while keeping it pressed.

Hey guys,
thanks for the answers. I tryed to flash only thees 3 files but it doesn´t change anything. fastboot works without trouble so far.
I tried multiple times the xiaomi flashing tool but this only throws errors -.-'
I will try again and keep you by the actual progress ^^

Ezio95 said:
Hey guys,
thanks for the answers. I tryed to flash only thees 3 files but it doesn´t change anything. fastboot works without trouble so far.
I tried multiple times the xiaomi flashing tool but this only throws errors -.-'
I will try again and keep you by the actual progress ^^
Click to expand...
Click to collapse
If you can get the fastboot to work, you can flash recovery on your phone for good or temporarily to flash zips.
How to do it?
1.Get into fastboot on phone
2.Install minimal adb and fastboot in your computer
3.Run adb and install drivers
4.Connect your phone which should be in fastboot to computer
5.Check for devices by using "fastboot devices", if a device is listed, proceed
6.Download a custom recovery, rename the recovery img to something easy than using the full name and copy the img into the folder where minimal adb and fastboot is installed
7.Type in "fastboot flash recovery <name you gave to recovery img>.img" (img for the image format) to flash recovery permanently
OR
7.Type in "fastboot boot <recovery name>.img" to use it temporarily, this method will erase the recovery on reboot so flash whatever you want before rebooting if you're following this method.
8.Flash in your ROM zip, try stock and custom ROMs, see if you can get your phone to work
GOOD LUCK

Same error with my yureka plus (error "remote: failed to write partition"). I'm planning to buy redmi 2 prime.. . Scared if this will happen to redmi 2 prime

Remove device encryption

Hi everybody, i would like to remove the devices encription under Security-Encryption
Under Encrypt device i've got Encrypted.
I've tried to restore to factory default, from recovery, from fastboot using format userdata, but, no way.
How i can remove the encryption?
My device is ZE552KL
Thanks

swet90 said:
Hi everybody, i would like to remove the devices encription under Security-Encryption
Under Encrypt device i've got Encrypted.
I've tried to restore to factory default, from recovery, from fastboot using format userdata, but, no way.
How i can remove the encryption?
My device is ZE552KL
Thanks
Click to expand...
Click to collapse
I had a same issue with this device, but I had some experiment.
If your device is unlocked, you can flash TWRP, boot to recovery, wipe, format data.
Backup your data first! It will erase all of your data (Very noob answer)
Totally careful, don't do this if you didn't want a unexpected things. Or something...

The ASUS Zenfone 3 comes shipped encrypted by default. This is required by Google's Play Services agreement for phone OEMs. You cannot remove decryption on the Zenfone 3 without using a custom ROM.

sensi277 said:
The ASUS Zenfone 3 comes shipped encrypted by default. This is required by Google's Play Services agreement for phone OEMs. You cannot remove decryption on the Zenfone 3 without using a custom ROM.
Click to expand...
Click to collapse
Thanks!

TWRP isn't allowing me to Mount my Storage because it's asking for a password I don't know.

ZeldaLinkAaron said:
TWRP isn't allowing me to Mount my Storage because it's asking for a password I don't know.
Click to expand...
Click to collapse
I'm having the same issue. I just got my daughter this phone (the 552KL?), downloaded the official Asus bootloader unlocker APK and ran it, then rebooted to the bootloader to flash TWRP.
TWRP installed, but wants a password to unlock it. Before the bootloader unlock, I did put her Google account on the phone, but the tool said it would completely wipe the phone. Either way, I tried her google account password, but it just says wrong password. Same thing when I tried to boot to system.
Any tips?

@Flapjack
Format through twrp

wang1chung said:
@Flapjack
Format through twrp
Click to expand...
Click to collapse
That's what I ended up doing. I got some help on another thread. The problem I'm having now is that I can't format /cache. It's really weird. If I do a full wipe on the phone, it says it can't format it. I even tried formatting it through fastboot ("fastboot erase cache" then "fastboot format cache"), which says "OKAY finished", but doesn't fix the issue when trying to wipe cache inside of TWRP.
This phone is flat out weird compared to other phones. I don't get the bootloader unlock screen. It doesn't seem to want to boot system... it just keeps going to TWRP. On the few times I have gotten to boot into system (after flashing Carbon 6.1 unofficial), it ends up hanging on a blank screen. Windows makes a sound that a new device is connected, so I'm guessing it's connecting in EDL mode or something (no devices show with a "fastboot devices" or a "adb devices").
I really don't know where to go from here. I'm used to working with Axons, Motorolas, and OnePlus phones. They just work.

@Flapjack
The cache issue is a glitch with the build of twrp, it's not a big deal. There's a workaround posted somewhere, can't remember. Just use the file browser and delete the files on it. I think there's only one file that isn't 0 bytes.
Have you flashed magisk?
Sometimes a full wipe (system/data) and then flashing the raw firmware helps. Try magisk first.

wang1chung said:
@Flapjack
The cache issue is a glitch with the build of twrp, it's not a big deal. There's a workaround posted somewhere, can't remember. Just use the file browser and delete the files on it. I think there's only one file that isn't 0 bytes.
Click to expand...
Click to collapse
So you're saying it doesn't need to be actually wiped, I just need to go into cache and delete all the files in there? How about getting it to boot to system? It just keeps booting to recovery. Not sure when it started that, as after the first time I flashed the ROM, I was able to get it to boot to system by pressing the power button when the "bootloader unlocked" screen came up. That isn't working now.
Have you flashed magisk?
Sometimes a full wipe (system/data) and then flashing the raw firmware helps. Try magisk first.
Click to expand...
Click to collapse
For my first non-stock ROM flash, I flashed the Oreo modem, Carbon 6.1 unofficial ROM, ARM64 Gapps nano, and Magisk 16.0... all at once. I tried booting and it looked like it was setting up... but as I mentioned, it just went to a blank screen. After trying a full wipe and seeing the "couldn't wipe cache" message, I figured that was why.
How will flashing Magisk help me with wiping the cache partition or getting the thing to boot right? Sorry for my ignorance.

Flapjack said:
So you're saying it doesn't need to be actually wiped, I just need to go into cache and delete all the files in there?
Click to expand...
Click to collapse
wiping/formatting cache is the same as deleting all the files. Wiping is easier but as I said, doesn't work at the moment.
Flapjack said:
How will flashing Magisk help me with wiping the cache partition or getting the thing to boot right? Sorry for my ignorance.
Click to expand...
Click to collapse
magisk won't help with cache, but it will remove the verity flag that is tripped from having twrp. From my experience, if I don't flash magisk, it'll bootloop.

Yeah.... absolutely nothing I do will get it to boot to system now. I've flashed the ROM and Magisk, but no matter what, it keeps booting to recovery.
There were two folders under /cache... "Lost&Found" and "recovery". I deleted both, but that didn't help.
---------- Post added 5th July 2018 at 12:40 AM ---------- Previous post was 4th July 2018 at 11:44 PM ----------
wang1chung said:
wiping/formatting cache is the same as deleting all the files. Wiping is easier but as I said, doesn't work at the moment.
Click to expand...
Click to collapse
So I take it I did it right? I would say it's "pretty much" the same. Formatting a partition is different than deleting files/folders in an existing partition. Still, if deleting the files/folders is good enough, then that rules out why the system wouldn't boot after the first ROM install attempt. It would also explain why "fastboot erase cache" seems to work, but TWRP still throws an error. Fastboot erase is probably working just fine.
magisk won't help with cache, but it will remove the verity flag that is tripped from having twrp. From my experience, if I don't flash magisk, it'll bootloop.
Click to expand...
Click to collapse
Is there a custom version of Magisk for this phone? I'm just installing the usual magisk 16.0 zip file you can get on their site, but it doesn't seem to be helping with the phone continuously booting into recovery. Is there a way to remove that verity flag via adb?

@Flapjack
Magisk modifies one of the partitions to get around the flag (I believe), not doable through adb.
Standard magisk off their site is fine
Try this:
Format system/data
Flash custom Rom
Flash magisk
"Wipe" cache and davlik
Reboot
OR
Flash the raw firmware
Flash twrp
Flash whichever custom Rom & gapps where needed
Flash magisk
Factory reset and "Wipe" cache and dalvik
Reboot

wang1chung said:
@Flapjack
Magisk modifies one of the partitions to get around the flag (I believe), not doable through adb.
Standard magisk off their site is fine
Try this:
Format system/data
Flash custom Rom
Flash magisk
"Wipe" cache and davlik
Reboot
Click to expand...
Click to collapse
No go. Still just boots into recovery. Here's what the boot screen looks like (then the Asus logo pops up, then recovery loads)
Code:
< More information :
Dm-Verity in EIO mode
Your device software can't be
checked for corruption. Please
lock the bootloader.
Visit this link on another device:
g.co/ABHg.co/placeholder
Your device will shutdown in 10 seconds
I can press the power button to boot immediately, or wait the 10 seconds... which just boots anyway (doesn't shut down). If I press the volume buttons, I get the following options menu:
Power off
Restart
Recovery
Fastboot
Back to previous page
Flash the raw firmware
Flash twrp
Flash whichever custom Rom & gapps where needed
Flash magisk
Factory reset and "Wipe" cache and dalvik
Reboot
Click to expand...
Click to collapse
I haven't tried this yet. Would this be the best guide to follow?
HOW-TO: Go back to Stock Rom on ZE552KL/ZE520KL
https://forum.xda-developers.com/zenfone-3/how-to/how-to-to-stock-rom-recovery-zenfone-3-t3666223

@Flapjack
That is the correct screen for an unlocked bootloader.
Try this guide for the raw firmware instead, and verify it boots to the OS. Then flash twrp and the rom again.

wang1chung said:
@Flapjack
That is the correct screen for an unlocked bootloader.
Try this guide for the raw firmware instead, and verify it boots to the OS. Then flash twrp and the rom again.
Click to expand...
Click to collapse
Grrr... no matter what I do, it won't flash. The guide says to put it in fastboot mode, but the flash tool won't detect it (even though "fastboot devices" shows it just fine). If I boot it to recovery, it'll show up in the tool, but never actually flashes (see screenshot).

Flapjack said:
Grrr... no matter what I do, it won't flash. The guide says to put it in fastboot mode, but the flash tool won't detect it (even though "fastboot devices" shows it just fine). If I boot it to recovery, it'll show up in the tool, but never actually flashes (see screenshot).
Click to expand...
Click to collapse
This is why I stopped using Windows. Maybe try disabling "driver signature verification"? Swap USB ports? My computer has some high power and low power USB ports, certain devices won't work properly in the low power ones. A couple of guides mentioned unplugging and re-plugging the USB.

wang1chung said:
This is why I stopped using Windows. Maybe try disabling "driver signature verification"? Swap USB ports? My computer has some high power and low power USB ports, certain devices won't work properly in the low power ones. A couple of guides mentioned unplugging and re-plugging the USB.
Click to expand...
Click to collapse
That's a good idea. I'm going through a powered hub right now, but who knows...
I'll try that as soon as I get home.

Ok, different computer. This is my laptop I normally use to flash.
This time, I can get it it to start to flash, but with a second or two, it throws an error (see attached).

Flapjack said:
Ok, different computer. This is my laptop I normally use to flash.
This time, I can get it it to start to flash, but with a second or two, it throws an error (see attached).
Click to expand...
Click to collapse
are you running ASUS flash tool with admin privileges?

FAILED to install ROM (

Hello, I failed to install a custom ROM and now when it gets to eRecovery mode I only have the options to reboot, shutdown and download latest verison and recovery. Of course, the download option doesn't work. I tried to get it back to the stock, the adb sees the device only when it's powered off, and it says unauthorized. The only time the fastboot devices show something is when the phone is in the fastboot mode I think and on the phone it displays: PHONE Unlocked and FRP unlock
When i try to fastboot flash system.img it says that FAILED <remote: Command not allowed>.
I tried to search for answers, can anyone help me please? I am doing this for 2 days...
LATER EDIT: I flashed boot,recovery, system. And now the options i have are: reboot system now, wipe data/factory reset, wipe cache partition. wipe data/factory reset just stops after 20%. What can I do?

Which device variant are you using? Which custom ROM did you try to install ? I think it would be better to post on the ROM's post...
Anyway fastboot should be use to flash recovery only, not a system. I'll recommand you to grab TWRP, install it via fastboot (fastboot flash recovery twrp_image_name.img . When it is installed, reboot recovery , back up product and vendor, Wipe everything and flash stock ROM.