please help my lg f320l fastboot - G2 Q&A, Help & Troubleshooting

my lg f320l i was install custom recovery and when restart it go to fastboot when i restart phone again it boot in system correctly and was no recovery on phone and now i update my phone by ota update and it now in fast boot and cant open download mode or system or any thing it give me {420} fastboot mode started
and when i connect usb it give me:
{420} fastboot mode started
[48820]-reset-
[48930]-portchange-
[49120]fastboot: processing comands
please help :crying::crying::crying:

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Hello!
On my LG Leon 4G LTE H340n there is a problem with booting, it stuckts at LG booting logo. When I try to put it in download mode (volume up and connect usb) it displays security booting error and then black screen showing only.
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To me the time that I came out this error was installing a Custom Recovery and could not fix it I had to send it to sat and I made ​​a change of motherboard do not know if there will be someone alla able to fix it but I think since you can not access the fastboot or the dowloads mode. Sorry for my English but this translated with google translator
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Lg flash tool put the phone automatically into download mode but your phone need to. Stay connected to your PC

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