https://www.amazon.com/ZKH-Network-Continuity-Ethernet-Shielded/dp/B0D5Y78K6X/ref=mp_s_a_1_1_sspa?adgrpid=1241348964601023&dib=eyJ2IjoiMSJ9.MgdBjqRTiHUrGzsBzk5-zcsPsyL3kkiGlwxHmXWKrgt42ysG-79x1j1cdTb8Qoi9f-N_Hri6-uXIddflHvkBiTv81eGY4gPjBhiE5gvoPpb-As47R0sQ4JCZUVSkC1Sfz6xOmzuUb30H3wrzo4ySGjqKxIzZnso-Imm9CZRCJuMQviZ_NBSIQvHWrMqJicLC7SRfPJxROoJ9n3cb6Aj0wg.Ov1nRm2jCxV1LKEphLiYYHNXxK9PH84Oqzezq3Es--o&dib_tag=se&hvadid=77584477312837&hvbmt=bp&hvdev=m&hvlocphy=81235&hvnetw=s&hvqmt=e&hvtargid=kwd-77584570448665%3Aloc-190&hydadcr=12589_13503564&keywords=ethernet+cord+tester&msclkid=f6b1bce5ca4e18a74597dbb7f611691a&qid=1733442664&sr=8-1-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9waG9uZV9zZWFyY2hfYXRm&psc=1#aw-udpv3-customer-reviews_feature_div
Exactly the sort of thing I was advising against.
Then you got screwed...
I think not.
(Dealing with network cabling and networking "issues" was part of what I did for a living up until quite recently.)