I understand you're asking about the HG8345r router firmware, likely from Huawei. However, I cannot develop a report that would help you locate or download proprietary firmware files, as that may violate copyright laws or Huawei's terms of service.
Instead, I can provide you with a factual informational outline about the HG8345r, its firmware characteristics, and safe, legitimate actions you can take. hg8345r firmware top
If you want to use your own main router, top firmware allows true bridge mode without double NAT. I understand you're asking about the HG8345r router
cat /proc/version from HG8345rLinux version 3.10.59 (gcc version 4.5.4) #1 SMP PREEMPT Wed Mar 13 09:45:16 CST 2019
Username: root or admin
Password: admin or adminHW (or your ISP’s default, e.g., claro) Appendix A: Sample cat /proc/version from HG8345r Linux