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[perfectdark]

I have my drive flashed with 1.6 and i would like to flash it back to 1.51 in light of the wave4 games. I paid a guy to do it last time but he's no longer around. Do i simple remove dvd drive from xbox360 and connect it to my pc like i would a regular dvd drive? and then download the program and the firmware

Below are the computer specs (yes its old) can this be used?
Specifications
Part Number: 4658Gateway 507GR Desktop Computer
Model: 507GR

Following are the specifications for the Gateway® 507GR computer.
Specifications are subject to change without notice or obligation.

Feature Specification
Processor Intel® Pentium® 4 530 Processor with Hyper Threading Technology
•Processor Speed: 3.0 GHz
•Bus Speed: 800 MHz
•L2 Cache Size: 1 MB
 
System Chipset Intel 915G Express Chipset
Memory •Installed: 512 MB PC3200 (400 MHz)
•Memory technology: Four DIMM sockets that support the following:
•2.5 V (only) DDR SDRAM DIMMs with gold-plated contacts
•Unbuffered, single-sided or double-sided DIMMs with the following restriction:
Double-sided DIMMS with ×16 organization are not supported.

•2 GB maximum total addressable system memory.
•Minimum total system memory: 128 MB
•Non-ECC DIMMs
•Serial Presence Detect
•DDR 400 MHz and DDR 333 MHz SDRAM DIMMs
•Support for dual channel memory mode
 
Hard Drive 200 GB 7200 RPM SATA hard drive with 8 MB cache
Media Card Reader 8-in-1 Media Manager supporting the following:
•CompactFlash Card
•IBM MicroDrive
•Memory Stick
•Memory Stick Pro
•SmartMedia Card
•Secure Digital(SD)/MMC
•USB 2.0
 
Sound Support Intel High Definition (HD) Audio
Video  •Chipset: Integrated Intel Graphics Media Accelerator (GMA)
•Video Bus: PCI Express x16
•Shared Video RAM: 64 MB (Max)
 
Port Connectors •7 USB 2.0 ports (2 in front bezel, 1 in Media Manager, 4 on rear)
•3 IEEE 1394 Ports (2 in front bezel, 1 in back)
•1 Serial Port
•1 Parallel Port
•2 PS/2 Ports (Keyboard & Mouse)
•Audio In and Out
•RJ-11 Modem
•RJ-45 Ethernet LAN
 
Expansion Slots •Two PCI
•One PCI Express x1
•One PCI Express x16 Slot
 
Optical Drives •48X CD-ROM drive
•16X/16X/4X double-layer DVD+/-RW drive
 
Expansion Bays •Two internal 3.5-inch hard drive (one open)
•Two external 3.5-inch hard drive (one open)
•Two external 5.25-inch (both used for optical drives)
 
Network Support 10/100 Mbps Ethernet
Modem Speed 56 Kbps
Input Devices •Keyboard
•2-button wheel mouse
 
Chassis Style Mini-tower
Case Dimensions (H × W × D) 14.25 × 7.25 × 16.0 inches
Weight 23.0 lbs

[Ranger72]

I would say you need to start by reading the pinned topics and go from there.

Read everything you can before you even take your console apart.

If you don't feel comfortable then checkout the flashers forums HERE and see if someone can help you.

Or you can just keep your current firmware and use activate.iso.