Default Note 3 soft bricked

Hello everyone I have a Note 3 SM-N9005 which is already rooted and had custom rom working fine.But since i bought my phone from eBay seller it won't work in GSM mode.It used to work fine in WCDMA mode but not on AUTO and GSM mode and showed not registered on network.
Someone told me in XDA that i need to go to a repair shop which has SPT BOX.
So i found one for $17 but he is saying that my phone got SOFT BRICKED in the process.CAN you guys help me to get back to normal..
He is saying that flashing the stock rom in odin will fix the problem.Plz if someone can help me out..
When phone is turned it looks something like this..
ODIN MODE
PRODUCT NAME: SM-N9005
CURRENT BINARY: Custom
SYSTEM STATUS: Custom
REACTIVATION LOCK(KK): OFF
KNOX KERNEL LOCK: 0x0
KNOX WARRANTY VOID: 0x1
QUALCOM SECUREBOOT: ENABLE (CSB)
RP SWREV: S2, T2, A2, A3, P3
WRITE PROTECTION: ENABLE
UDC START