Which files do I need to flash with fastboot to get a stock device state?

I have downloaded the stock ROM for my Mediatek (MT6580) device. Extracting the files leads me to a couple of *.img files and SP Flash Tool. I am currently on a Linux distro and have adb and fastboot packages installed, and am not able to use the SP Flash Tool. I was wondering which files do I need to flash to get a factory version of the phone. fastboot getvar all shows these outputs

(bootloader) 	max-download-size: 0x8000000
(bootloader) 	partition-size:userdata: 32000000
(bootloader) 	partition-type:userdata: ext4
(bootloader) 	partition-size:cache: 10000000
(bootloader) 	partition-type:cache: ext4
(bootloader) 	partition-size:system: 5d000000
(bootloader) 	partition-type:system: ext4
(bootloader) 	partition-size:metadata: 2560000
(bootloader) 	partition-type:metadata: raw data
(bootloader) 	partition-size:nvdata: 2000000
(bootloader) 	partition-type:nvdata: ext4
(bootloader) 	partition-size:tee2: 500000
(bootloader) 	partition-type:tee2: raw data
(bootloader) 	partition-size:tee1: 500000
(bootloader) 	partition-type:tee1: raw data
(bootloader) 	partition-size:frp: 100000
(bootloader) 	partition-type:frp: raw data
(bootloader) 	partition-size:expdb: a00000
(bootloader) 	partition-type:expdb: raw data
(bootloader) 	partition-size:logo: 800000
(bootloader) 	partition-type:logo: raw data
(bootloader) 	partition-size:para: 80000
(bootloader) 	partition-type:para: raw data
(bootloader) 	partition-size:keystore: 800000
(bootloader) 	partition-type:keystore: raw data
(bootloader) 	partition-size:secro: 600000
(bootloader) 	partition-type:secro: raw data
(bootloader) 	partition-size:oemkeystore: 200000
(bootloader) 	partition-type:oemkeystore: raw data
(bootloader) 	partition-size:recovery: 1000000
(bootloader) 	partition-type:recovery: raw data
(bootloader) 	partition-size:boot: 1000000
(bootloader) 	partition-type:boot: raw data
(bootloader) 	partition-size:lk: 60000
(bootloader) 	partition-type:lk: raw data
(bootloader) 	partition-size:seccfg: 40000
(bootloader) 	partition-type:seccfg: raw data
(bootloader) 	partition-size:protect2: a00000
(bootloader) 	partition-type:protect2: ext4
(bootloader) 	partition-size:protect1: a00000
(bootloader) 	partition-type:protect1: ext4
(bootloader) 	partition-size:nvram: 500000
(bootloader) 	partition-type:nvram: raw data
(bootloader) 	partition-size:proinfo: 300000
(bootloader) 	partition-type:proinfo: raw data
(bootloader) 	partition-size:preloader: 40000
(bootloader) 	partition-type:preloader: raw data
(bootloader) 	off-mode-charge: 1
(bootloader) 	warranty: no
(bootloader) 	unlocked: yes
(bootloader) 	secure: no
(bootloader) 	kernel: lk
(bootloader) 	product: RS615
(bootloader) 	version: 0.5
all: Done!!
finished. total time: 0.012s