Answering my own question after almost two years.
Yung PLDT R051 is the same with the Ergo R0516 and Globe R01 in terms of hardware.
Proof:
https://fcc.report/FCC-ID/2AR45-CPE/4116822.pdf...
Note: kung hindi kayu na openline Suggest ko mag downgrade kayu ng Baseband
PLDT HOME R051 Firmware Openline Mode. with Simple BandLocking with apps NotionLink for android!!
* Convert Wan mode
*QOS
etc...
Flash Tru TFTP
Download
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WARNING: I am not liable in any way if your router becomes bricked. Flashing should be done with good connection to the router and stable power supply.
This is modded firmware from bjarnco32 's thread...
Share ko lang ang ALL-IN-ONE generator. Please do not abuse or gawing for sale. Wag nyu pagkakitaan hehe.
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Enjoy! Will takedown kapag ginamit sa pagbebenta or ibinibenta.