Question Haviing trouble unlocking bootloader - Sony Xperia 1 IV

I followed the steps, but I can't get into bootloader mode. Please help. When I reboot to bootloader, the screen is blank and doesn't respond to fast boot commands.

---

Turn off phone then hold volume up and plug into computer to get to bootloader mode (screen should still be off)
If computer doesnt recognize fastboot mode then your computer is lacking the right driver

---

I did follow the steps and downloaded both the google USB driver and driver for my device model from sony mobile communications via 'install OEM drivers'. Did I miss anything? In fact, how do I remove and reinstall both drivers if they are faulty?

---

RP1408 said:
I did follow the steps and downloaded both the google USB driver and driver for my device model from sony mobile communications via 'install OEM drivers'. Did I miss anything? In fact, how do I remove and reinstall both drivers if they are faulty?
Click to expand...
Click to collapse
I remember window 10 and 11 block driver if you install normal through double click. You need to get to device manager and update driver manually. Google it

---

i tried but still the same problem. From this screenshot , could you make out anything regarding anything ive might have missed. i installed the google usb driver and fastboot driver by the device manager as stated in the previous comment.
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}

---

RP1408 said:
i tried but still the same problem. From this screenshot , could you make out anything regarding anything ive might have missed. i installed the google usb driver and fastboot driver by the device manager as stated in the previous comment.View attachment 5805835
Click to expand...
Click to collapse
Boot windows in safe mode, and disable driver certification and reinstall the driver.

---

RP1408 said:
i tried but still the same problem. From this screenshot , could you make out anything regarding anything ive might have missed. i installed the google usb driver and fastboot driver by the device manager as stated in the previous comment.View attachment 5805835
Click to expand...
Click to collapse
Hey, man I had a problem with the drivers in bootleader mode on my 5 IV as well. Which had the Android under Other Devices with a question mark, meaning it couldn't find the drivers.
You could try forcefully installing the drivers for the device as I explained how to do in my post here: https://forum.xda-developers.com/t/...-and-flashing-firmwares.4537183/post-88051049

---

Make sure you don't have US version because you can't unlock bootloader on it

---

RP1408 said:
i tried but still the same problem. From this screenshot , could you make out anything regarding anything ive might have missed. i installed the google usb driver and fastboot driver by the device manager as stated in the previous comment.View attachment 5805835
Click to expand...
Click to collapse
There's a Sony driver you jeed to use, SA2000 or some weird name. Did you get that one? Install it by right clicking on the Android device name with yellow warning triangle. Select the install disk manually and assign that one to manually install