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ramDeleteFromExplorer() called an undefined `_ber_len()` helper, so clicking Delete / Delete All raised a ReferenceError right after the confirm and no APDU was ever sent. The inline builder also omitted the mandatory Le byte. - new pure `ramDeleteApdu(aid, withCascade)` = GP Card Spec v2.3.1 Table 11-20/23 form: `80 E4 00 <p2> <Lc> 4F <len> <AID> 00` (P2 00 = object, 80 = object and related objects), used by the Explore handler. - `scp81DeleteApdus()` (the "Delete AID" script template) now shares the same builder: it used to send the raw AID without the mandatory '4F' TLV. - tests: exact bytes for 7/16-byte AIDs and both P2 modes, the SCP81 script expectations updated to the TLV form, and a wiring check that the undefined helper call does not come back (`_ber_len(`). 611 frontend / 495 Python green; version 3.6.6; sw simple-v279.