Here is a post which will be helping you to boot your LG Phoenix P505 into the fastboot mode. Or also as many people call it, the download mode.
What is Fastboot/Download Mode?
For the people who really don’t know that what it is. Here is some of the brief information about it, which will be helping you to have an idea about it. Download Mode or the Fastboot Mode is a mode which helps the user to connect the device to a Computer or a Laptop and then flash some files using it.