Stuck in Fastboot Mode - Model 100011886 / ONA19TB003 - Walmart Onn Tablets General

Bought this tablet several days ago to replace my Acer tablet (rooted). My intent was to root this new one to enable side loading to use as a reader, primarily.
I am stuck on the Select Boot Mode screen : Fastboot Mode selected.
Power or Volume buttons do nothing at this point.
Any assistance would be appreciated.

Update: Allowed battery to discharge. Recharged the battery. Now booted normally.
Will try to set fastboot again with volume+ pawer button and see what happens.

Tried to enter fastboot again. Same problem as above. Picture attached.
{
"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"
}

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I did not installed any root and tried to unlock bootloader but suddenly my phone does not boot. It just stucked in Samsung logo. I tried to factory reset it booted for a while but it comes to boot loop after some time. Their is an error showing in recoverymode shown below. Anyone knows the cause of problem?
{
"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"
}
Mine did same. I powered on holding home volume up and power etc. Then get a wierd blue screen with triangle and dead android icon instead of the usual factory reset settings etc.
So what i did was hold down both volume up and volume down and power button for around 5 or 10 seconds.
Viola - it booted up

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Hello, I rooted my device. Then I wanted to unlock the bootloader again. Unfortunately my tablet won't turn on anymore. How can I recover my device?
{
"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"
}
First charge it to make sure it has power.
Then with the device off, press vol up and vol down and insert usb cable while holding the buttons and see if you can get into download mode.
aslan4789 said:
Hello, I rooted my device. Then I wanted to unlock the bootloader again. Unfortunately my tablet won't turn on anymore. How can I recover my device?
Click to expand...
Click to collapse
Hi, same issue here.
Have you found any solution yet?

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{
"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"
}
I'm in the same boat. Have you managed to get into the recovery somehow?

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Last night my Pixel 4 freeze and the only way to try to unfreeze it is to reboot the device.
After that I'm trapped in fastboot mode:
{
"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"
}
I've tryed to press every button and restart the device 7 times, as google support said to me, but no improvements.
I've also try to let discharge the phone, then plugin with volume +, no improvements. Samewith volume -
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{
"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"
}

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