Provide ART backup files (Atheros QCA9558/QCA9880-AR1A) for TP-Link Archer C7

I´m looking for ART (Atheros radio firmware) backups for an old TP-Link Archer C7 V1.0. Please note that I´m not talking about the firmware itself (that anyone can it download from TP-Link site) but the radio firmware for Atheros QCA9558/QCA9880-AR1A. If you have an old spare TP-Link Archer C7 V1.0 (must be this version, not 1.1, not 1.2, etc) and can install the latest OpenWRT on it, them you can save mtdblock contents from ART and win the project. I already found a backup in a forum (dumpArcherC7v1.bin) but it´s not good (only a partial dump without QCA9880-AR1A). .