Can't boot into download mode

It is true that it is very old and I also have a new phone, but I do not want to install the root or system modifications on it or store viruses on it, so I want to revive that phone, so I consider it like a dangerous mission phone .
 
It is true that it is very old and I also have a new phone, but I do not want to install the root or system modifications on it or store viruses on it, so I want to revive that phone, so I consider it like a dangerous mission phone .
Gotcha, if you can't boot into download mode , might be hardware issue.
 
No its software
can usb jig turn on phone
It might be but in order to correct a software issue you would need to get into download mode which you can't so it can very well be replacing hardware to fix it .